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2-Piece Polypropylene Trailer Vent for 3" Diameter Hole - White

2-Piece Polypropylene Trailer Vent for 3" Diameter Hole - White

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This 2-piece vent provides an inexpensive yet attractive way to ventilate your enclosed trailer. Round interior vent and half-moon-shape exterior piece are both constructed of white, UV-resistant polypropylene plastic that holds up to sun exposure. Lowest Prices for the best rv vents and fans from Redline. 2-Piece Polypropylene Trailer Vent for 3" Diameter Hole - White part number WHMAV2-WAVT2 can be ordered online at or call 1-800-496-5010 for expert service.
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Redline RV Vents and Fans - WHMAV2-WAVT2

  • Wall Vent
  • No Fan
  • 6W x 8L Inch
  • White
  • Redline

This 2-piece vent provides an inexpensive yet attractive way to ventilate your enclosed trailer. Round interior vent and half-moon-shape exterior piece are both constructed of white, UV-resistant polypropylene plastic that holds up to sun exposure.


  • Affordable trailer vent provides continuous ventilation for your enclosed trailer
    • To increase ventilation, you can install more than 1 vent
  • 2-Piece design creates a low-profile vent that's attractive both inside and outside your trailer
  • Half-moon piece with flat, slotted side attaches to trailer's exterior
    • Slots are on one side only, allowing you to position the vent for best airflow and to help prevent water from getting in
    • Drain holes at the corners let out any water that does get in
  • Round, slotted interior piece installs inside your trailer
    • You can easily trim vent tube to fit thin walls
  • UV-resistant, polypropylene plastic construction stands up to the elements
  • White color


  • Fits 3" diameter hole in enclosed trailer
  • Exterior half-moon piece
    • Overall dimensions: 8" long x 6" wide x 1-1/4" tall
    • Flange width: 1/2"
  • Interior circular piece
    • Diameter at flange: 4-1/8"
    • Vent tube outside diameter: 2-15/16"
    • Tube depth: 1-1/2"
    • Flange width: 1/2"
  • 9 Screws (sold separately) required for installation
  • Sealant sold separately

WHMAV2-WAVT2 Alliance 2-Piece Enclosed Trailer Vent - UV Resistant Polypropylene Plastic - White

Customer Reviews

2-Piece Polypropylene Trailer Vent for 3" Diameter Hole - White - WHMAV2-WAVT2

Average Customer Rating:  4.7 out of 5 stars   (163 Customer Reviews)

This 2-piece vent provides an inexpensive yet attractive way to ventilate your enclosed trailer. Round interior vent and half-moon-shape exterior piece are both constructed of white, UV-resistant polypropylene plastic that holds up to sun exposure.


Easily and effortlessly installed. They are made of nylon or flexible plastic I believe. White, powder coated aluminum would have been better but after a few hours of searching these were the nicest looking and the best price.


These vents were exactly what I needed and was looking for to install on my home built steel frame aluminum skinned motorcycle trailer to create a positive continues in and out air flow to vent summer inside heat and fuel fumes out of the trailer that does vent from the m/c gas tank.
I installed a total of four vents, two up front, one on each side high near the roof facing forward to force air in when the trailer is in motion and two on each side at the lower rear facing aft (rearward) to exhaust which will create a vacuum effect as the trailer is moving forward.
Installation and painting was done pretty much the same way mentioned by a previous review made by Ray H. on 5/24 .

I will add this helpful hint to make your multiple vent install go quick and accurate. If you first make a installation jig out of a piece of scrap 1/2 to 3/4 inch plywood large enough to trace the outside vent screw holes onto, but first drill the 3" hole with a hole-saw then slide the inside round vent tube through the plywood then fit the outside vent onto the inside thru tube collar now you can trace exactly where you need to drill the outside vent screw holes and everything will be aligned for a correct fit when you drill through your trailer wall. Now all you do is drill and secure with screws this plywood jig temporarily onto your trailer and drill all your holes and the plywood jig will insure your hole saw doesn't wobble or elongate it's pilot hole either.
Last but not least, let me say that the entire staff at E-Trailer are the best regarding fast courteous and follow up service even after your order has been processed whether you order on-line or by telephone and you will become a repeat customer like myself for all your trailer needs but never for the same thing twice unless it's for another project..(:
I'm including some pic's showing the partial to the finished vent installation but sorry I did not take a picture of the plywood jig.

Without thinking there is a photo of the plywood jig, its shown in pic number two where it also doubled for the inside backing for the outside vent screws to attach and give more bite for the screws to hold on to rather then just the thin wall aluminum skin, i just made one extra to use as a continuous pattern jig so the inside vent grill will fit exactly into the outside collar every time.
-- comment by: Wal H - 08/24/2013
Its been more then a year, I believe I had bought and installed those vents during the summer of 2013, and now to report all is still good with these items like the day they were installed, of course right now the trailer is covered tent style and sitting outside in the cold of winter here in upstate, NY.
Wal H - 02/20/2015
Hey have you noticed if any rain gets in at all when theres strong wind? I have a e150 cargo van I use as a conversion and need vents, seriously thinking about these, but gotta be sure about the rain issue
-- comment by: Mark S - 08/04/2015
Hello Mark,There is a drain hole at the bottom of these vents to allow water to drain out if and when you are trailering in the rain, so wind driven rain when parked is not a problem.Walt
-- comment by: Walt - 08/04/2015


Ordered 2 sets of half moon vents. Installed in 15 mins on enclosed trailer to help keep mold.from growing. Easy peasy! Fast shipping and cost was more than reasonable.


Installed two of these in the side wall of a pop-up trailer converted to carry large gasoline-powered radio controlled model aircraft and a small electrical generator. The wall thick ness was over the length of the inner vent part, so I sliced off a ring from the inner vent and used a 2" pvc pipe coupler with a relief gap sliced out to enable it to fit inside the inner vent and the sliced ring. A circle of metal screen was attatched to the inside of the inner vent with hot glue, then the pipe coupling was inserted and attached with countersunk flat head screws. This assembly was fitted into the 3" hole cut in both inner and outer walls. The coupling was marked 1/4" outside the outer wall and trimmed. The sliced ring was then attached to the coupler with countersunk flat head screws. This assembly was attached to the inner wall with screws and sealed with RTV. The outer vent then had a bead of RTV applied to the inner lip, and attached to the outer wall with screws. One vent assembly was installe high facing forward and the other was installed low facing to the rear. These will serve to vent any gasoline fumes from the interior of the trailer.


Finally got a break in the weather to install my Redline WHMAV2-WAVT2 Wall Vents. They were a breeze to install. The price was very competitive, and I enjoyed the rapid delivery. As I upgrade my Cargo Mate, I’ll be relying on for all of the needed parts.

By the way, I painted the outer covers with Rust-oleum Metallic Charcoal to match the trailer skin color. For the Rust-oleum to adhere, the polypropylene vent has to first be lightly wet sanded with 400 grit sandpaper and thoroughly rinsed. Then a couple of light coats of Krylon Fusion for plastic was applied. This gives a solid base coat for the Rust-oleum to bond to.


they actually sent me a used one.
in road dirt and scratched up

I am so sorry about that Richard. Customer Service will fix this issue for you.
-- Etrailer Expert Sierra K - 09/07/2021


The vents installed easily with the help of a 3” hole saw. I wish the inside pieces were a little longer to help with the alignment of the outside pieces. That would depend on the distance between your inside and outside walls. I had a roof vent but these will allow good air flow keeping the trailer fro getting too hot inside.


Even thou the trailer we have has a roof vent, I wanted to be sure air was moving when you strap a motorcycle down the gas tank vents into the atmosphere when its been jostled around.These were easier to install then I thought. all pieces were with the order arrived quickly. I would recommend


Even thou the trailer we have has a roof vent, I wanted to be sure air was moving when you strap a motorcycle down the gas tank vents into the atmosphere when its been jostled around.These were easier to install then I thought. all pieces were with the order arrived quickly. I would recommend


Plan on installing them this oming week.


It was a easy install. Inside just cut a 3" hole. Rivet the 3/16.
Outside, used synthetic caulk to seal and also rivet.

Outside, used synthetic caulk to seal and also rivet.
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Installed these on my new enclosed trailer that will be used for landscape equipment. Put one on the driver's side high and the other low on the opposite side. etrailer was very fast on shipping my order.


my only complaint with this one is that the round vent did not have adequate depth to reach all the way through the trailer wall. it leaves a gap that dust and bugs can get into the trailer wall.


I purchased two of these vents for my expedition camper, they work great. I was worried about fogging dirt road dust inside the trailer, so I took some filter material and put it on the inside which does a nice job of keeping it out.


Glad I found etrailer I had been wanting to add venting to my toy hauler for a long time. Fumes from the bikes would be strong in the living area. Not good for people and safety. Installed one vent high and one low to create a natural draft. The 3" hole is just anough for the small garage space in my toy hauler. It took about 30 minutes to install two. Also added two in my car hauler. Used some lath screws and Goop to seal exterior cover. It looks just like the factory vents. This product does what I wanted and at a reasonible price.

I am still very pleased with the vents I installed last year. There is no sign of weathering at all. My car hauler has old cars or tractors in it at all times. The ventilation lets the fumes out and makes it safer when I use electric tools inside. I am looking for a similar vent that can be closed during very cold temps. Etrailer has all the good stuff, so I am power shopping today. I am sure they have something I need.Thanks Bullet Bob
Bobby T - 01/27/2015


The trailer door hinges and latch system have been on my custom trailer for well over a year and a half. They function great and still look like new. Great products and would certainly buy them again. Also the shipment and correctness of the order was perfect. My follow up orders of several accessories were also handled in a totally professional way and the products were equally high quality.

The hinges and latch are working fine. The trailer is used regularly and the parts show now fatigue and I would recommend them.
John W - 05/07/2018


What a great product. They let air in and not the elements. I used them on my fish house to let more air in for the vent free heater. I received them shortly after I ordered. Thanks for the good service.


Great Vent. I installed one on each side and eliminated the broken roof vent with no ventilation issues.

Terry D - 06/07/2021


They worked perfectly even though I dropped one right out of the package l. It cracked pretty easily, luckily it cracked on the edge where I was able to silicone it to the trailer. The install video was also helpful.


These vents appear to be very good quality. Especially for the price. Installation looks to be straightforward. I'm impressed with etrailer's packaging, shipping, and communication.

These vents have worked very well. Theyve been through heavy rain with no leaks.
Rich L - 04/07/2016


Light weight plastic, will see how well it lasts during first freeze.


Vent is exactly what I'd hoped for except for one minor issue; the inside vented piece tube is just a bit too long. My application is on a thin (about 1/8" thick) fiberglass trailer wall and when the inner piece is pressed up against the outer one (to seat it against the inside face of the cover), it is about 1/16" too long for the screw face to be on the same plane as the screw face of the outer piece. If I put a strip of butyl caulk under the screw holes on the inner piece, I'll have to put 2 layers under the outer piece holes to keep from deforming the outer piece when I tighten up the screws. Also, the excess caulk is not very "pretty" since my trailer side and the vent are white and the caulk is very dark. I can use a file to trim the inner tube but it should be made flush to start with. Other than that, it looks like it will be a very good vent for my use! (vent for refrigerator bay inside my cabinets)


This vent has not shown any signs of wear in a year's time. I converted a cargo trailer into a toy hauler and use this vent to assist with keeping any fume build-up as well as overall ventilation for the Fantastic Fan.


The vents arrived in a timely factor. I needed these because i haul a Harley, generator, and 2 5gal. gas cans in an enclosed 10 ft trailer. There was quite a bit of a fume build up, but it appears to be greatly reduced after installation. The walls of the trailer were a little wider, so a bought 2 2"abs couplings to extend the inner piece properly. I used a wood block and hammer to seat the abs to the right level. Snug fit but worked perfect.


product is pretty basic but exactly what I wanted, the same as I have seen on other trailers. Installation is a breeze with a 3" holesaw and some self tapping screws.
Etrailer service is by far, Top Notch. product was at my door before i expected it and even though not an expensive piece, packed as if it were fine china.


Show More Reviews

See what our Experts say about this Redline RV Vents and Fans

  • How To Install the Redline Trailer Vent # WHMAV2-WAVT2 on an Enclosed Trailer
    I do not have an installation video on the Redline Trailer Vent, part # WHMAV2-WAVT2, but I can help you with the installation. The tools you will need are a caulk gun, drill, a 3-inch hole saw, a 3/16-inch drill bit, and a flat-tip screwdriver. The other parts you will need I have listed below in the instructions. The # WHMAV2-WAVT2 vent is two pieces. The # WAVT2 is the 3 inch round interior vent that will need to be installed in a 3 inch diameter hole on your trailer. You will need...
    view full answer...
  • Can PVC Be Added To Install the 2-Piece Polypropylene Trailer Vent On a Thicker Wall
    In regards to the 2-Piece Polypropylene Trailer Vent part # WHMAV2-WAVT2, I must recommend you install the vent using both the inside and outside components. If the wall thickness is too much to use the vent as is, all you will need to do is take a piece of PVC to bridge the two together. I have attached for you below a review on a customer who did the same. I checked with Redline and they don't offer the specific measurements you are looking for unfortunately.
    view full answer...
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  • Vent for Transporting Poultry in an Enclosed Trailer
    I can't tell you for sure how much ventilation you need to transport your poultry because it's really out of my wheelhouse. With that being said using the Trailer Vent # WHMAV2-WAVT2 is a very viable solution. We often see vents like this installed on the side of enclosed trailer towards the front with open side facing forwards and then another of the vents towards the rear of the trailer facing backwards. The idea is to create a pass through of air flow.
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  • How Does the Half Moon Vent # WHMAV2-WAVT2 Install
    The vent uses a 3 inch diameter hole in the trailer. The half moon portion is flush mounted to the outside of the trailer. It is not necessary to cut any holes in the vent. The interior trim piece is deep enough that it will pass through the trailer wall and mate up with the raised circular portion of the outside half-moon portion. The part is also available in black, as part # HMAV2-AVT2. I have edited a photo of this vent in black so that you can more easily see how the vent goes together.
    view full answer...
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  • Can the Polypropylene Trailer Vent Be Trimmed to Fit Thin Trailer Walls
    If you find that the wall of your trailer is too thin then you would have to trim at least one of the pieces to allow for a secure fit but make sure it is a straight cut and not an angle cut. Otherwise it may not fit properly together.. ideally you would want a little wiggle room to adjust it as needed without leaving too much of a gap. As for the positioning I would have blades facing down so it is harder for moisture to get in.
    view full answer...
  • Vent Positioning for Trailer Vent # WHMAV2-WAVT2 to Prevent Rain/Exhaust from Getting in Trailer
    To keep exhaust out of the # WHMAV2-WAVT2 you will need to install the vent higher on the trailer than the exhaust preferable on the side of the trailer. The further back on the trailer the less chance you would have for exhaust to get in. Having the vent point down or to the rear of the trailer will also prevent rain from getting in the trailer while traveling down the road. This will allow the vent to function more as an exhaust vent. We have several customers who have installed the...
    view full answer...
  • Would the 2-Piece Polypropylene Trailer Vent # WHMAV2-WAVT2 fit a 2 in Thick Wall
    Yes it will, the 2-Piece Polypropylene Trailer Vent # WHMAV2-WAVT2 that you referenced would work on a 2 inch thick wall. You would just need to cut a 3 inch diameter circle hole in that wall and attach either side of the # WHMAV2-WAVT2 and it would function just fine.
    view full answer...
  • Which Way Should 2-Piece Polypropylene Trailer Vent be Placed
    If it were me I would install the trailer vent # WHMAV2-WAVT2 with the fins angled down to reduce the amount of rain that could fall into the vent. Having it at the front of the trailer should be fine since the tow vehicle is going to act as a screen for a large portion of the wind. Also, most trailer tires are not rated for speeds over 65 miles per hour so you will want to keep an eye on that! If you want air flow-through then you would want one vent at the front and another at the back....
    view full answer...
  • Side Vent for Enclosed Trailer with Interior Wood Paneling
    You can still use butterfly vent # 371800. The wood paneling in the trailer should not be an issue because no matter what material is on the inside you would have to cut a hole for the vent. If there is a gap between the outer and inner walls of the trailer then you could bridge that gap with some small gauge sheet metal such as tubing used for clothes driers. A vent such as # WHMAV2-WAVT2 might be a better option. I have linked a video review of this vent and the butterfly vent as well. I...
    view full answer...
  • How Should the 2-Piece Polypropylene Trailer Vent be Positioned when Installing
    On the 2-Piece Polypropylene Trailer Vent, # WHMAV2-WAVT2, I would mount it near the top front of the trailer with the vent openings pointed down or towards the rear of the trailer. Ultimately, it does not really matter. Use some self-tapping screws like # 31071 and some sealant like # 0160297 when installing the vent.
    view full answer...
  • Vent Recommendation for Storage Box on Trailer to Reduce Condensation
    If you installed the 2-Piece Polypropylene Trailer Vent # WHMAV2-WAVT2 on your storage box with the half circle portion on the outside of it facing down it would be pretty hard for rain water to get in the box. Especially if you sealed it with a # 344270KITW as you installed it. I attached a review video for you to check out as well.
    view full answer...
  • Recommended Sidewall Trailer Vent for Cargo Trailer
    A 3" diameter vent hole is very common for enclosed trailers. I suggest you first completely remove old vent material and measure the opening. If you do have a 3" diameter hole, my recommendation is the 2-Piece Polypropylene Trailer Vent for 3" vent holes, # HMAV2-AVT2. This 2-piece vent provides a great way to ventilate your enclosed trailer. The round interior vent along with the half-moon-shape exterior piece are both constructed of black, UV-resistant polypropylene plastic that holds...
    view full answer...
  • White Side Wall Vent For Enclosed Trailer With Refrigerator
    I do have an option for you but the Mushroom Vent - White part # 37202-29125 is designed to be a roof vent. I recommend to use 2-Piece Polypropylene Trailer Vent for 3" Diameter Hole - Black part # WHMAV2-WAVT2 which is designed to be installed on the side walls of your trailer and has a cover to prevent water from getting in. I have attached a very helpful video for your reference. You will need Zinc Sheet Metal Screw - 8 x 3/4" Indented Hex Washer Head part # 31071 to install it.
    view full answer...
    Image 1 for
  • Recommended Wall Vent for Enclosed Trailer with Gas Water Heater
    I recommend our Redline 2-Piece Polypropylene Trailer Vent # WHMAV2-WAVT2. This wall vent will work on a trailer wall up to 2 inches thick and can be installed in any convenient location on your enclosed trailer where you have or can make a 3-inch diameter hole. This wall vent is designed to provide a constant flow of air, and is louvered on one side so you can adjust it when installing for the best airflow and to help prevent water from getting in. You can use a sealant for installation...
    view full answer...
  • Best Mounting Orientation of WAVT2-WHMAV2 2-Piece Polypropylene Trailer Vent
    If you mount the Redline 2-Piece Polypropylene Trailer Vent # WHMAV2-WAVT2 with the exterior part's flat slotted side facing forward (to increase air flow) there will definitely be a greater probability for rain and splashed water to enter the trailer. Still, as you noted from the customer-submitted photos we show on that item's page some have done this, and surely for the same reason. If you happened to stay in dry/desert areas this will be less of a concern but since you are in the...
    view full answer...
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  • Attaching the Redline 2-Piece Roof Vent to the Front Side of a Cargo Trailer
    Yes, you can mount the Redline 2-Piece Roof Vent, # 9139, on the front side of your cargo trailer. You will want to mount this vent with the vent slots facing down to prevent rain water or other elements from getting into the trailer. If you are looking for vents for the front side of your trailer, then I would recommend the 2-Piece Polypropylene Trailer Vent, # HMAV2-AVT2. This vent is designed specifically for the sides of trailers and is an inexpensive option that is also available...
    view full answer...
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  • Function Of Trailer Vents On Enclosed Trailer
    The vents we offer for an enclosed trailer like part # 9139 are designed to allow air into the trailer. None of the vents we offer create a pressurized condition in the trailer and none are equipped with an air filtration system to keep dust out. Some of the features on the vents like # 9139 allow you to adjust the amount of airflow in the trailer with a butterfly valve mounted on the inside of the vent which would be operated from inside the trailer. Other trailer vents, like part #...
    view full answer...
  • How Does Enclosed Trailer Vent Keep Rain Out of Trailer?
    The enclosed trailer vents we offer are designed to keep the rain out and the best option would be the 2-Piece Side Vent for Enclosed Trailers # 9139. As you can see from the accompanying photo the exterior piece is angled to keep rainwater out and it also has an interior baffle that will direct rainwater to drain holes in the corner of the vent. The butterfly vent also allows you to close it if you'd like. To install this vent you will need 20 screws and four #10/32 machine screws as well...
    view full answer...
    Image 1 for Image 2 for
  • Trailer Roof Vent Recommendation for Moving A Lot of Air Even in Rain
    We have the Fan-Tastic Vent Roof Vent w/ 12V Fan # FV802250 which has a larger fan in it that can move 920 CFM. For a cover to help prevent rain getting in we have the part # FVU1500WH which will go over the top of the roof vent when open and allow the vent lid to be open with the fan moving air at all times. For a side vent we have the part # WHMAV2-WAVT2 but it does not have a filter built into it.
    view full answer...
  • Can a Solar Powered Plumbing Vent be Used on an Enclosed Car Hauler Trailer
    You could use plumbing vent # UF53-945001 for your enclosed car hauler trailer. On the inside what I would do is get some screen (like for windows) that does not restrict air flow (as good for air flow as you can find) and cover the opening on the inside of the trailer. But this fan has a very low cubic feet per minute air movement rating and might not be the best option. Another option is to use vent # HMAV2-AVT2 or # WHMAV2-WAVT2. The openings point down so installed on the side or front...
    view full answer...
  • Availability of Vertical Mounted Vent Fan
    The rain shield used by the MaxFan # MA00-07500K Deluxe Roof Vent Fan does an excellent job of excluding water when installed in its typical horizontal orientation, but simply stated the fan wasn't designed to be installed horizontally. The vent would admit water into the interior of the vehicle. In addition to that, the varied turbulence that would be experienced at the rear of the vehicle rather than straight line winds it would see mounted to the roof would likely tear the vent fan unit...
    view full answer...
  • Can 6-1/4 Diameter Ventline Vanair Trailer Roof Vent be Installed on the Wall
    Although I'm sure you could mount the Ventline Vanair Trailer Roof Vent # VP-543SP vertically on your wall, when I reached out to my contact at Ventline he said that it wasn't built to function that way so it may not operate properly. You could instead install a wall vent like part # 9139, # HMAV2-AVT2, or # WHMAV2-WAVT2 to help promote airflow if you don't want to/don't have room for an electric vent on your roof.
    view full answer...
  • Installing Vent in 6x12 Enclosed Cargo Trailer To Keep Interior Cool When in Storage
    The # UF53-945001 solar-powered plumbing vent probably won't do what you're looking to achieve. The vent is very low powered, and is designed to provide a small amount of ventilation to draw odors from the stack on a black water tank on an RV. It wouldn't have enough draw to do much to lower the temperature in your trailer. I'd recommend installing a vent cover like # MA00-933066 which is compatible with standard 14 x 14 roof vents. With this in place, you could leave existing roof vent...
    view full answer...
  • Will Ventline Vanair Trailer Roof Vent Rain Proof
    The Ventline Vanair Trailer Roof Vent with 12V Fan # VP-543SP is not going to be completely rain proof (no roof top vent will be), because they need to be open somewhat, as you can see in the accompanying photo a customer sent in of this vent installed. Though I do recommend closing this vent in the rain, you can add ventilation by installing a vent on the sides of your van. The 2-Piece Polypropylene Trailer Vent for 3" Diameter Hole # HMAV2-AVT2 (Black) or # WHMAV2-WAVT2 (White) will...
    view full answer...
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