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

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

Item # HMAV2-AVT2
Our Price: $19.22
RV Vents and Fans
Orders above $99 qualify for Free Shipping
Shipping Weight: 0.36 lbs
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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 black, UV-resistant polypropylene plastic that holds up to sun exposure. Great Prices for the best rv vents and fans from Redline. 2-Piece Polypropylene Trailer Vent for 3" Diameter Hole - Black part number HMAV2-AVT2 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (189)
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Redline RV Vents and Fans - HMAV2-AVT2

  • Wall Vent
  • No Fan
  • 6W x 8L Inch
  • Black
  • 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 black, 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
  • Black color
  • 9 Screws and sealant (sold separately) required for installation


  • 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: 5/8"

HMAV2-AVT2 Alliance 2-Piece Enclosed Trailer Vent - UV Resistant Polypropylene Plastic - Black

Customer Satisfaction Score:

Customer Reviews

2-Piece Polypropylene Trailer Vent for 3" Diameter Hole - Black - HMAV2-AVT2

Average Customer Rating:  4.8 out of 5 stars   (189 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 black, UV-resistant polypropylene plastic that holds up to sun exposure.


The product is constructed very well and after watching the video to install in my trailer, looks fairly simple to install.

Still working and providing air flow into the trailer.
Tim - 12/12/2022


My 5x8 enclosed trailer was overheating due to no arrangements for ventilation. I added the 2-piece polypropylene trailer vents along with a rooftop solar powered plumbing vent and my problem was solved. The inside of the trailer temperature remains pretty much close to ambient temperature


Excellent product and easy to work with. Great service.

I was concerned however about insects entering through the vents so came up with a filtration system.

Used a PVC coupling and some filter material. Cut the coupling to 1/2 inch rings and remove just enough material to allow an inside press fit. Cut round filter and insert first then hold in place with the ring.

On the outside vent cut a long narrow piece as shown.

When installed as shown, adds very good double filter and allows air to move freely. Just finished a 6000 mile trip clear across the country and back and filter performed perfectly. Eliminating the heat build up AND keeping the bugs out.

JIM : ]

I really like this idea and thanks for taking the time to document and post this info. What is the blue filter material, where did you find that and how is it secured to the external vent piece?Best regards.
-- comment by: Herb L - 08/02/2014


Great communication from the pros at Et


Another review (above) recommended using a plywood jig. I took their advice and was glad I did. They did not include images, so I am. It made the install SUPER easy. 1) Use a scrap piece of 1/2 or 3/4" plywood slightly larger than the exterior vent. Find center of plywood and use 3" hole saw to make opening. Insert the round interior vent (loosely) from one side, and then loosely attach semi-circular exterior piece. Pinch all three pieces together and set on a flat surface. Trace the outline of the semi-circular vent onto the plywood. Make marks at the 6 screw hole openings. 2) Drill through plywood at the 6 screw openings. 3) locate vent position on exterior of trailer (note: make sure the shape of the vent corresponds to the flow of air!!!). 4) place plywood jig at desired loaction (press against exterior of trailer) and drive at least 4 self-tapping screws through plywood and into trailer wall (make sure to use screws long enough to penetrate thickness of plywood). 5) now that plywood is attached to exterior of trailer, use a hole saw to cut through metal and plywood interior wall. The jig will keep your saw in perfect path. 6) Apply silicon to inner rim of 3" round interior vent cover. Press into opening. 7) My interior vent was the perfect depth - It was flush with exterior of trailer wall. If yours is too long, cut to proper depth. Apply silicon at seam where metal opening meets end of interior vent (added protection against rain). 8) Add silicon bead on underside of exterior vent flange. Align with screw holes (from jig attachment) and drive 6 self-tapping screws. Good luck!


We use these in all of our trailers, they work just fine, we have had no issues with them. They just provide a little extra ventilation. We use them as a wall vent with lots of silicone behind the screws, and have had no issues with water infiltration or insects. One of our go-to products.


We use these on every trailer we make, very good heavy duty vent, attractive, adds a design element to the trailers. We use both black and white vents, depending on the side color of the trailer. Yes, we are kind of trailer nerds! And we do love e-trailer!


We use two of these vents on every trailer that we make, and are nothing but happy with the condition, the price and the functionality of it. Such a simple concept that just works so well for some additional ventilation.


Great Product!


I recommend this product. They have been on my trailer for a year without any problems.


Those parts that we purchase from etrailer always arrive as advertised and in a timely manner. The parts (we are a teardrop trailer manufacturer, and are notoriously hard to please!) are sturdy and well made. Have never had an issue with this company in the four years we have used them as one of our suppliers.


Quality, fast delivery


Cool, calm, and collective was my experience.
fixed for 15$
Predicate ya folks


Ticks all of our boxes for passive air flow. Have been using them in our trailers for years now. We use two per teardrop, one on each side of the trailer for cross ventilation.


My part came in a few days, very fast turn around


Fast shipping, great communication and excellent customer service. Quality products


Just finished installing my new vents, very easy to install and look pretty good as well, hopefully they serve they're purpose.
Any ventilation is better than none.


I needed a rainproof vent for an outdoor electrical equipment box (WiFi). This item fit the bill perfectly. It's mounted on outside of box and an exhaust fan is mounted over the 3" hole on inside. Only used the interior vent as a guide to line up exterior part with 3" hole.

Glad I ran across this item while searching for a vent and eTrailer gave quick shipment.

I am looking to ventilate a fiberglass camper shell, especially to reduce interior condensation from breath while sleeping in cold andor rainy weather.Rather than a roof vent, I want a vent like this, or the louvered vent, and a small 12 volt fan attached. I imagine it mounted on a vertical wall of the camper shell, not the roof.Can you please describe in greater detail the exhaust fan you mounted over the 3 hole inside? Even if not a 12 volt fan, I would like to see the fan, as I may be able to find a 12 volt version.
-- comment by: Joel N - 05/02/2015
I used a small Box Fan 3. Google Box Fan 3IN and youll get lots of hits. They come in various voltage ratings. I used 110vac, 12vdc, and 5vdc fans depending on what was available. Be advised these small fans do not move a lot of air for a camper.One thing to consider for camper installation is dust. There is no shutoff on these vents. Ive found travelling on dirt roads sucks in dust through any open holes.I had a camper problem just like yours. My solution was to spray the interior walls with a simulated fabric spray. Dont recall brand or where I got it. However it stopped getting rained on when sleeping inside. Some sort of vent is also desirable. It must be rain proof and close off for dust protection.
-- comment by: RussB - 05/14/2015
Vent is holding up well after 1 year in AZ sun.
RussB - 08/01/2015


No complaints. I'm not sure how efficient the air transfer it through this vent, but it was easy enough to install, and has been water tight. It's installed to vent my battery compartment through the rear of my teardrop trailer.

Still no complaints. Almost had a bear test its durability while camping in tahoe, but chased it away before it investigated too closely.
Dan G - 07/26/2021


The outside finish has witness marks from the molding process. I’m sure it will work good. Low score for finish


Installed these vents in a new enclosed trailer that only offered the overhead vent. I couldn't leave that vent open during bad weather. Using this trailer as transportation as well as storage. Motorcycle requires venting and HMAV2-AVT2 was a snap to install.

Outstanding, looks new.
Scotty B - 07/31/2017


I installed a pair of the vents at the top rear of an insulated 24ft car hauler. Simple to installed using a highly recommended hole saw. The purpose was to create some natural convective updraft keeping it dry, cooler, and ventilated when using it for long term storage. The provided screws were replaced with Stainless to avoid future rust bleed. There is no gasket provided for the exterior and although it may not be necessary to avoid rain finding its way into the interior, one was improvised using some strip seals (like sticky gum) around all but the bottom so any water could drain. They seemed a bit restrictive for free air flow where the cylindrical shell interfaces the rain guard inside the outer cover. This is necessary to the design for universal left or right installation, but knowing where they be installed allowed the guard to be trimmed up to just below horizontal with out effecting the rain protection. They worked out good, although I would have like to see the available in 4" and 6" sizes.


Great Product..
Great to do business
with you company.
They are already installed.
Very Pleased, I will do business with you again.


Not so Impressed. There doesn't seem to be much better airflow in my trailer. I installed 4 vents. The way the product is designed seems to block air from coming instead of letting it flow.

They dont seem to help much at all to be honest. 4 vents and still hot in the trailer.
Mirabify - 07/27/2020


My trailer is light weight easy to pull, even loaded don't even fell like its there . The only issue i had and still have the travel lights don't work properly, Ive check the power plug on my truck got a new adapter . I had my dealer ship check its not the truck or plugs. Its some were in the walls of the trailer i really don't want to take apart the walls travel lights to me are not that importation just tail, and break lights im good with my trailer.

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