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Butterfly Vent - 7-1/4" Round

Butterfly Vent - 7-1/4" Round

Item # 371800
Our Price: $12.85
RV Vents and Fans
Shipping Weight: 0.32 lbs
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Great Prices for the best rv vents and fans from Redline. Butterfly Vent - 7-1/4" Round part number 371800 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (113)
  • Q & A (0)
  • Videos (1)
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Redline RV Vents and Fans - 371800

  • Vent
  • Butterfly Vent
  • No Fan
  • 7-1/4 Inch Diameter
  • Silver
  • Redline
  • Metal

  • Measures 7-1/4" edge to edge
  • Butterfly-style opening

371800 Redline Round Butterfly Vent

Video of Butterfly Vent - 7-1/4" Round

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Review of Redline Enclosed Trailer Parts - Butterfly Vent - 371800

Ellen: Hey everyone, I'm Ellen here at and we're going to be taking a quick look at the butterfly vent for your enclosed trailer or really any kind of camper that you want to have a little ventilation too. So let's take a closer look at it and make sure that this is going to be the right piece for you. It does have that butterfly style opening to let in fresh air and stale air out. This measures about 7 1/4 inch in diameter. The opening for that butterfly vent is about 3 1/2 inches at that widest point and across it's about 5 5/8. It's about 1/4 of an inch thick.

The distance between the mounting holes center to center is about 6 1/2 inches. It does not come with any mounting hardware so that is something that you will have to pick up on your own. There is a screen that can go with this that's also available here at It should be listed as a related part on the product page, so you can pick that up to go with it. That's pretty much going to do it for our look at the butterfly vent.

I hope this video has been helpful and thanks for watching..

Customer Satisfaction Score:

Customer Reviews

Butterfly Vent - 7-1/4" Round - 371800

Average Customer Rating:  4.8 out of 5 stars   (113 Customer Reviews)


Worked out great!


These butterfly vents were replacements on a 1994 horse trailer that we are refurbishing. The old ones were solid rust and couldn't be saved. Though today's vents aren't made as large as the old ones, we can make them work and are good quality for this job without a huge investment. We're waiting to install until after we repaint the outside of the trailer so no photos at this time. Fast shipping was also a plus. Thanks etrailer!!



The vents were great quality for what we needed to finish out the trailer for resale. Though I cant attest to how theyre holding up since we sold the trailer, I assure you we wouldnt have added something that we werent positive would hold up for years.


I love Etrailer, they have everyday parts as well as hard to find ones. I've ordered parts a couple of times , delivery is always spot on and George is very helpful. The butterfly vent I ordered fit exactly. Same holes no drilling.


Product made good and looks great.. Great customer service Heather is very knowledge of the products they offer.. Thanks etrailer

Eric R.


Still using the product and still Great performance one year later. Thanks Guys.. ????


The round vents I bought have worked very well. I used them for air vents on my beagle box. I wouldn't hesitate to order them again!

Ashley S.


Still works and looks as good as the day I bought them


Over the past several months I have been reconditioning an older cattle trailer. I changed all the lights and replaced the electric brakes. All the repair items were purchased from etrailer. All the items were received in a timely fashion and found to be exactly as described on their web site. I now have a functional, road worthy trailer. Using etrailer made this job a lot easier.


Great product ands customer service from start to finish! They work great on a smoker.


Excellent product, fit my 70's model horse trailer perfect. Super fast fast fast shipping!



The product is still great, thanks again!


I had a really tough time finding these butterfly vents for a trailer I am restoring. Etrailer had them in stock and delivered them extremely fast and a really good price. The vents themselves were completely covered in protective film to prevent ant scratching of the surfaces. I am very happy with the product and the service I received from etrailer.


I searched for the best price I could find on butterfly vents and it was here at They processed my order quickly, shipped fast, and the product itself was high quality. I really like that there is enough friction when opening or closing the vent that I don't think they will open or close on their own when I'm driving down the road.


It was exactly what my husband was looking for. We have an enclosed trailer but dust comes in the vents when going down our gravel road. We placed these over the top of the vents on the inside of the trailer. We shut them to keep the dust out!


These are sturdy and tight vents. I was surprised just how tight they are, the adjustment discs stay in place without any concern about vibrations changing their positions. I bought them for a pilot lab steam treatment unit and installed them on a plexiglas enclosure. Being aluminum they look good and will not corrode. Very cost effective.

Delivery was fast and courteous!


Ordered these for an old horse trailer my husband and I are restoring. Quality of product is great. Ordered this product on a Monday and it was at my door by Thursday!!! Great Company, Great Products, Great Prices, and EXCELLENT Shipping!! Would def order from them again.


I put these vents on my dog box.


As of 3/11 the UPS has lost my package. They left a pkg at my house but it was not from etrailer, but they marked yours as delivered. Now they can't seem to find my butterfly vents! etrailer did a great job on their end as usual.


Great product with excellent service!!!!!
won't be left in the dark with etrailer, they go above and beyond to inform you of shipping progress!


Received these vents in a timely manner. They look great! Have not applied them to the trailer yet as it is being painted but i expect them to work perfectly!


Nothing but RAVE reviews for Parts were exactly as ordered, great price, fit perfectly. Couldn't be more elated with the fast service too!


I purchased 2 for a horse trailer. I cut out only the butterfly to make it stronger and after 1 year, around 1000 miles, everything is still perfect. I do recommend them.


Needed ventilation for the smoker I built. Worked out perfect. I chose aluminum over stainless for the price.


Product as expected, but the costomer service was SECOND TO NONE. Got an e-mail when the order was received, when the order was filled, when it was shipped, and when it was delivered. Order was made late, late one night - shipped the next day - received at the house the next. Takes a lot to impress me, but impressed me.


I really liked the fast shipping, the butterfly vent worked great,highly recomend etrailer


The product will be used for a vent in a dust collection enclosure on the underside of a router table. Will get pictures later.


Product arrived in great condition. Our large order was split to improve delivery time, these will help with air balancing our ss kitchen ducting. customer service did a great job.


I used them on my truck dog box for ventilation. Worked great, thanks.

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

  • Installation of Redline Butterfly Vent # 371800
    On the Redline Butterfly Vent, part # 371800, the location of the nob does not really matter, usually on either side. We recommend to install the butterfly vent on the trailer so that the triangular openings of the vent are parallel to the ground, with one triangular opening to the front of the trailer and the other triangular opening to the rear of the trailer. I am including a link to a video review of the vent and in the video he will be holding the vent the way we recommend to install...
    view full answer...
  • What Is the Butterfly Vent 371800 Made Of
    The Butterfly Vent part # 371800 is made of aluminum.
    view full answer...
  • What Material is Butterfly Vent for Trailers 371800 Made Out Of
    This butterfly vent is typically used on horse, stock, dog and various other types of trailers. It is a full 7 1/2 inch in diameter with four mounting holes around the edge. The polished aluminum is attractive as well as being a useful source of ventilation.
    view full answer...
  • Is the Butterfly Vent Waterproof and Will it Stay Closed or Open
    This Butterfly Vent # 371800 that you referenced is not waterproof. If the vent was on the side of the trailer it would not get direct water sprayed at it when it is raining so it should not let too much moisture through. If you left the vent in either the open or closed position it would move. The amount of friction in the vent assembly would prevent it from moving just from the vibrations of the trailer rolling down the road. With that being said, it is not difficult by any means to...
    view full answer...
  • How to Install the 7-1/2 Inch Round Butterfly Vent # 371800 on an Enclosed Trailer
    To install the 7-1/2 Inch Round Butterfly Vent, # 371800, you will need to drill or cut a hole in your trailer that is 5-7/8 inches diameter to no more than 6 inches diameter. If you have access to a hole saw this size for a drill the wold be the cleanest way to cut the hole. A smaller hole could be used, but the butterfly may rub on the trailer sides if a smaller hole is used. The mounting holes on this vent are 4-9/16 inches on center and the distance between the inside of any two holes...
    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...
  • Watertight Replacement Option For A Leaking Butterfly Vent
    The only option we carry that could provide a more watertight vent for your trailer would be the 2-Piece Polypropylene Trailer Vent for 3" Diameter Hole # HMAV2-AVT2, but this would require some alterations to the wall of your trailer to fill in the gap left from your 7-7.5" butterfly vent.
    view full answer...
  • Differences Between Butterfly Vents Part # 371800 and Part # PLR24-002
    The only differences between the vents is that part # PLR24-004 comes with a rubber gasket and part # 371800 does not. The mounting holes are also positioned a little differently. They are both 7-1/4" in diameter and made of a polished aluminum. If you are concerned with rust then I highly recommend using the Butterfly Vent part # PLR24-002 which is made of stainless steel.
    view full answer...
  • Availability of Butterfly Type Trailer Vents
    We do indeed offer trailer butterfly vents, as well as other types, and you can see items # 371800, # PLR24-002 and # PLR24-004 on the linked page. I also linked our main page for all trailer vents and vent parts. We carry replacement parts for many of the vent products we offer.
    view full answer...
  • Venting a Sprinter Cargo Van to Keep Interior Temperatures from Climbing in Summer
    The Redline 2-Piece Polypropylene Trailer Vent # HMAV2-AVT2 that you referenced is a good option for your application in the summer time, but this vent does not allow you to seal it off in the cold months. A good option for your application is a butterfly-type vent that will allow you to open and close the air flow as required. Redline offers their round butterfly vent # 371800 that is shown in the linked video. This vent will withstand highway speeds but do note that there will be some...
    view full answer...
  • Recommended Vents for 10 x 20 Foot Shed
    The only vents we have that will work for the shed walls are manual open and close. The 2-Piece Side for Enclosed Trailers - Metal - 10" x 12" # 9139 is the nicest option and will close from the inside for the winter heating. You can use the butterfly vent # 371800 on the exterior if you so desire but it gives you not interior help. The Side Cowl Ventilator with Screen # PLR1715 is the option I recommend because of your desire to open from the outside. This has a gasket for a nice...
    view full answer...

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