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This vent cap uses a patented siphoning design to pull odors and gases up and out of your black water holding tank before they can enter your living space. By creating a natural, upward vacuum in the vent pipe, it prevents pressure buildup that pushes smells through toilet seals. It works immediately—no breeze required—and keeps air inside fresh without using chemicals or perfumes.
Because the vent constantly draws fresh air into the tank, it helps create an oxygen-rich environment that speeds up waste decomposition. That means you don’t need additives or perfumed treatments to keep things under control. The result is a cleaner, more efficient tank system that manages odors at the source instead of masking them.
With no moving parts to wear out, this vent cap is completely maintenance-free. The black polycarbonate construction is tough and UV-resistant, so it stands up to sun and weather over the long haul. An integrated bug screen also keeps insects and debris out of the vent for reliable performance trip after trip.
You can install it as a complete replacement or just upgrade the lid on your current vent. The universal design fits 1-1/4", 1-1/2", and 2" diameter pipe stacks, with a funnel included for 1-1/2" setups. A PVC adapter sleeve may be needed for 1-1/4" or 2" stacks. The top attaches to the base with sealant for a secure fit, and once it’s in place, it works automatically with no upkeep required.
At just 4-1/2" in diameter and 3" tall, the vent has a low, compact profile that blends in on the roofline. The base is RVIA 1192 compliant, giving you a durable, properly rated part that’s built for long-term use.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Today we're going to take a look at the Lippert Components 360 Siphon RV Holding Tank Vent Cap. This comes in black. This is going to do a great job of eliminating those nasty odors that can occur in your RV from that black water tank. A lot of the times the gas can build up and just create a back feed into the commode in your bathroom and it's just kind of a hassle. So, this is going to be a differently designed cap to help eliminate that. Basically it's going to create a vacuum to pull those gasses up and out of your RV.
By doing that it's going to not only pull that fresh air in and out, it's going to create a more oxygen rich environment inside that black water tank so you don't have to use any many chemicals to break down all of the solid waste inside there.It's going to basically work by fitting into your vent at the top of your RV. It does come with this funnel. This is going to work for your one and a half inch tube. If you have a two inch you won't need to use that funnel it'll just fit directly in there. There's detailed instructions on how to get this installed in the instructions that it comes with.
So, if you we're just replacing an old cap it shows a couple of different designs there and how to get this installed as well as how to install it on a taller roof stack and how to just install it from scratch if you're replacing a broken one or one that maybe was properly installed before. There's also a pretty good diagram on the back showing exactly how that works and to eliminate the odors from your RV.There's going to be a pretty easy set up. There's no moving parts, no maintenance required and once it's installed it's going to work pretty much immediately. As soon as the wind goes across it at the top it's going to help to pull that air up and out. It does have a universal fit, again this is going to work for one and a half to two inch pipes.
If you need an adapter you can pick one up separately. You will need to get some adhesive as well as some other components. They are listed in your instructions again to help get that completely installed. Those are available separately as well.This is going to be made of a strong poly carbonate construction so it's going to be really durable. As you can see this one is going to come in black.There is a built in bug screen there to help keep unwanted pests out of your black water tank.
And this comes in black but it's also available in white. The part number for that is going to be LC389381 and that is available here at Etrailer.com. And that's going to do it for our look at the Lippert Components 360 Siphon RV Holding Tank Vent Cap in black.
Customer Satisfaction Score:
93% were satisfied with this product
7% of customers were not satisfied
Ratings & Reviews
Works great, no problems
Very please I went with this vent.
Well, it was a needed part, since I lost one during hurricane Ian. I ordered it and received it very quickly, and it looks like as good as new. Thank you goes out to you and your staff for helping me with this. I will buy from you again whenever I need to do work on my RV.
I purchased this to replace the original vent on my Winnebago that was built in 1999. It went on easily and works well. I received fast shipping and great service from etrailer.
I would give this 5 stars, but it is difficult to install and special sealant required on inside components and piping whereas other vents only require regular rv outside sealant such as butyl tape, eternabond tape and self leveling sealant . It would be helpful if this was included in the product description on the website instead of "Sealant or an adhesive (sold separately) is required" . We as rv owners already know that sealant is required, but 3m 5200, or Sikaflex 221 is specifically mentioned in the instructions which can't be read until the carton is irreversibly opened. These are not normal sealants on hand. Job is done waiting for results.
Exactly what I needed
Looks like it's a great product but not the size I need. When looking at the photos it had seven mounting holes. Only has four.
Quality crafted part, provided by Lippert, to replace vent ripped from the roof of our Airstream camper, by a low hanging utility wire.
Removal and replacement was a snap !
Great Service very fast
Just installed and the directions were clear. Easy to do. Definitely a superior design over the old one. At the very minimum you can see the insects nest and easily clean.
Always great service, and quick shipping with etrailer. Never a worry when i order parts from them. Got to love a company that does what they say, and follows up to be sure everything went as expected. Thanks etrailer.
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James
3/31/2025
So far, great! Traveled to both coasts and back, held up well and does its job.