Your sewer vent cap is what allows your holding tanks to air out any bad odors.
You'll quickly learn the hard way if this becomes clogged or damaged in any way as it'll begin causing the RV to stink.
It's essential when shopping for a new cap, to find something that's suited to your RV.
Comparison Chart of the Best RV Sewer Vent Caps
Camco Replace-All Plumbing Vent Cap with Spring Attachment
Best for the Money
Siphon RV P360 Siphon
Lippert Components 389380
Ventline V2049-03 Colonial 1-1/2"
What is Sewer Vent Cap and What is it Used For?
A sewer vent cap is used to help disperse any bad odors from your holding tank, effectively. If you end up with it clogged, you'll soon regret not buying a higher quality version.
The devices take natural airflow and use it to extract these bad odors compared to covering them up with perfumed scents, as most holding tank cleaners do. It's far more effective and cost-effective compared to using fancy holding tank cleaners, not to mention more eco-friendly.
Characteristics of our Favorite Models
You'll soon notice a few unique characteristics from specific models that make them stand out from any competition. The following section will discuss these qualities in greater detail.
A vital feature of any vent cap is that it uses the power of nature to help limit any bad odors from entering your home. They do this by taking natural airflow and essentially flushing these bad odors and gases out of your holding tank. This makes for a far more natural solution to keeping your RV odor free.
Anything that sits on top of your roof is going to have a high chance of being discolored or cracked because of all the sunlight it'll have beaming down on top. It's important for this reason, that your vent cap has adequate UV protection against any outside force, especially sunlight.
Being able to attach your vent cap easily is important as this saves the hassle and also the risk of breaking anything. Multiple vent caps have easy attachment solutions like using tension springs, which means you'll not need to replace the full vent.
Quick Take - The Best RV Sewer Vent Caps
Before you go any further, here are our top picks for the best models:
Review of the Best RV Sewer Vent Caps
The most important part of our article is the section in which analyze the various features, pros, and cons of a handful of vent caps we believe to be the best on the market.
This model will ensure that you'll never have to put up with any disgusting smells coming from your holding tank ever again. It will fit perfectly onto any two-inch vent pipe by using the simple tension spring attachment that allows to you easily take it off or put it on without any hassle.
The ABS plastic material they've used is protected against any UV damage, which is a common problem with anything on top of your RV roof. Light and heat will crack or discolor your vent if not protected.
This is currently the best sewer vent cap on the market for a few reasons. First, because of the UV protection this cap has, this means it won't suffer from any discoloration or cracking due to the heat or sunlight. The device is also super easy to install, which is a huge benefit for any RV owner, as every second counts.
You'll be assured this product will last a while as its made from highly durable ABS plastic, one of the strongest materials for RV products. The final benefit is that it'll fit onto any two-inch vent, so compatibility isn't an issue. The only downside with this product is that it doesn't come with a base so you might need to use the old one.
You'll never have to suffer from horrible holding tank smells with this model. It will effectively use the natural airflow coming from the environment around you and flush the odors out. The installation is fairly easy as the holes have already been drilled into the base, so all you need to do is drill through the holes to secure it on to the RV.
The white design will easily blend into your RV’s color-scheme and will stay the same color for years down the line thanks to the effective UV protection provided. This model can either be bought as a single unit or as a pack of six. You'll have greater compatibility with this product as you'll be able to connect it to any vent pipe between 1-2 ⅜ inches.
This product came close behind the best overall place for a few reasons. It has plenty of benefits, such as being able to retain that gorgeous, brand new look because of the effective protection against UV damage such as discoloration.
It'll take no time to install either, another huge benefit. The reason for this is because the base system - which is also provided - also has pre-drilled holes at the sides, therefore, all you need to do is secure it to the RV by drilling screws through those holes.
You'll also find that this model is compatible with a variety of vent pipe sizes ranging from 1-2 ⅜ inches in diameter. The only downside with this product is that the material will have a higher chance of being damaged after sudden or constant weather changes.
Best for the Money:
This two-piece vent cap comes as a base system with some pre-drilled holes, which makes it easier to install, as well as your actual vent cap that simply clips into place. The entire system will be able to support any model that has a diameter of up to 1.5 inches.
The clean, white design is what gives it such a lovely look for it to blend into the RV color-scheme, this color will be protected for years thanks to the effective UV protection, which also protects it from cracks due to constant changes in temperature. The polyethylene material is used in plenty of other RV-related products due to the strength of the material.
This product is currently the best value for money that you'll get on the market. The two-piece vent comes with pre-drilled holes to ensure the setup process is easy for anyone to do. A huge advantage of this product is the durability of the polypropylene material, which will absorb any damage or accidental hits without taking the full vent cap out of business.
Another important protection this model has is the UV protection that limits any chance of cracks and ensures there's no discoloration for a long-lasting life. The one disadvantage of this product is that it only covers a small pipe diameter of up to 1.5 inches. This greatly limits its compatibility.
This product is fantastic in the sense that it's really effective in drawing out any bad odors by just using the natural air pressure. The way it works is by following the direction of the wind. It does this by rotating up to 360 degrees to ensure it has the best airflow possible. This technique flushes out any foul odors or gases from the holding tanks.
An attraction of this is that it doesn't require any drills or screws to secure it to your RV. All it takes is some special sealant and you'll be sorted. If you need to take the it back off, you can easily do so without removing the base system and then clip it back on when ready again.
The final feature of this is that it has a UV protecting resin coating that'll protect your investment for years down the line from discoloration or cracking due to the extreme heat.
This product is one of the more attractive models on the market. The reason for this is because of the hassle-free installation. The vent cap and base don't require any drilled holes or screws piercing through your roof. You'll also notice that this product works with the wind and not against it by rotating up to 360 degrees to ensure proper airflow to flush out any bad odors.
One of the best features of this is the UV resin that coats the product to ensure no discoloration or cracking from sun exposure for years down the line. The only downside with this product is that it's hard to be 100% certain that your vent cap is secured properly unless you use waterproof sealant.
This model is a godsend for any RV owner as it'll immediately begin to flush out any foul odors and gases in your holding tanks. The way it works is by rotating up to 360 degrees to catch any airflow that could be sucked down into the holding tanks and then is pushed back out by the air pressure.
Your typical holding tank agents will take up to two days to successfully mask or expel any gases and smelly odors. The installation is easy and is extremely secure in the sense that the holes are already drilled, so all you need to do is screw it into place.
However, before screwing the it down, you should use some waterproof sealant, which will ensure a proper secure fit, even during storms. It'll also fit on any 1 ½ to 2-inch vent pipes.
This product is a great option for any RV owner looking for a replacement or upgraded vent cap. The cap is easy to install and requires no drilling as the holes are already pre-drilled. All you'll need is a screwdriver and some waterproof sealant. Once the cap has been set up, it'll start working immediately by sucking up any odors and expelling them through the vent.
The way it works is by rotating up to 360 degrees to have airflow do all the work and flush out any odors in the holding tank. It will also fit any standard or small vent pipe from 1 ½ to 2 inches in diameter. The only downside with this product is that there's no sign of any UV protection, so discoloration and cracking might be possible.
This cap has a few unique features that will instantly attract any experienced RVer. The whole system does exactly what it says it can do. The odor-preventing system will be fitted easily as it boasts its universal fit, meaning it can work with most, if not all, vent pipes.
The 360 intake design will flush out any odors by pulling in oxygen-rich air which then pushes out any gases, as well as setting up a perfect breeding ground for bacteria that break down waste easily and fast.
This model has a unique feature called a bug screen, which is built-in, meaning that you'll have no spiders or small insects crawling in through the vent during winter time.
This system is one of a kind because of its highly-effective, built-in bug screen. A huge problem for RV owners is when insects find their way into your RV through these sort of vents.
However, this effective form of defense against infestation will take care of that for you. You'll also greatly benefit from the standard function of this, which is flushing out any gases or foul odors by causing an updraft. The 360 design is what makes it so effective and you'll start noticing results immediately.
The manufacturers also boast that this can fit on any pipe, which means you'll not need to worry about any compatibility issues. The only fault with this product is that the plastic material isn't durable enough, as it'll crack fairly easily.
This cap has a unique feature that hasn't been seen yet on this list. It offers a new effective method to clean out your holding tank odor.
The solar-powered fan provides extra fresh air, which makes the whole process faster in extracting that foul smelling odor and gases from the holding tank.
A feature of this vent cap is that it has no wires whatsoever and it switches on/off automatically. The powder coating finish is what makes the vent cap retain its bright, white color. The installation of it is also quite simple as all you need to do is use some waterproof sealant and install the screws, all the drilling has been done for you.
There are plenty of benefits that come with this model. It has a few unique features like the solar powered fan, which will really boost the efficiency and speed at which you extract any foul odors. Even though it's solar powered, there are no wires whatsoever, so you'll not need to worry about covering anything up.
Another benefit is that the protective powder will stop your product from eroding or becoming discolored. The only downside with this is that it's made from plastic, which will often break under strain from the weather. You might also experience the fan beginning to stick after a while.
This product is one of the easier vent caps to install because of the pre-drilled holes on the base system. You'll only need the bare minimum of drilling done on your RV roof, and the vent cap itself is a simple snap-on cap fastened to the flange with some screws.
The durable plastic is actually a thick polyethylene material, so you'll not experience any severe damage on this vent system.
Another important quality is the UV protection you'll have on this vent cap. It'll be enough to keep your original bright color for years down the line. The final feature of this vent cap system is that the two-piece product will be able to fit any 1 ¼ and 1 ½ vent pipe.
This model is one of the more basic models on the market. However, it still offers plenty of benefits. The material it's made from is thick and durable enough to survive a proper beating. This could be from falling branches or a tight squeeze under a bridge, and having such a robust vent cap is a huge benefit.
Another benefit is the UV protection you'll receive. You'll never suffer from any level of discoloration from constant sun exposure. The last benefit, and probably one of the best, is that you'll not be sweating over the installation of this product as all holes are pre-drilled and all you'll need to do is secure it down on to your RV with some screws and waterproof sealant.
There are a couple of downsides to this product. The first being that it won't fit any vent pipes larger than 1 ½-inch in diameter, with the standard being two inches. The final downside is that there's no built-in bug defense.
How to Replace Your RV Sewer Vent Cap
Replacing your RV sewer vent cap can be relatively straightforward. All you need to do is follow our step-by-step guide. We promise it'll help you properly install your new vent cap with almost no hassle at all.
- Remove your old vent cap. By removing the cap, you'll be able to see the vent pipe which should be poking out the top of your RV.
- There should be drilling holes from the last vent cap. You'll want to put a small smidge of sealant over each hole and then circle around the diameter of where the vent will be with more sealant. Be generous with it.
- Add the frame of the vent cap and then, depending on what type of vent you have, you'll need to drill the screws into the holes or simply let the sealant hold it down.
- Add the rest of the vent cap and you should be ready to go.
If you want a more detailed demonstration of installing your new cap, please take a look at this video:
You'll have realized by now that installing your vent cap isn't tricky whatsoever and you don't need any experience at all to successfully pick the correct option. All you need is a helping hand, and we genuinely hope we've helped you out by showing you how to find the best vent cap for your RV.