Camco 40137 RV Plumbing Vent Cap | Fits 2-Inch Pipe

If you spend any time on an RV roof, you already know these caps don't last forever. The sun bakes them, the wind grabs them at highway speed, and sooner or later the little cap on your plumbing vent is just gone. The Camco 40137 is the fix. It's a replacement cap for your RV's plumbing vent, finished in black, and it fits vent pipes up to 2 inches across.

Here's the part that matters. It's just the cap. You don't have to pull the whole vent off the roof, re-seal the base, and redo your sealant just because the top blew off down the interstate. Camco designed this as a separate cap with a spring tension attachment, so it snaps right onto the existing pipe and holds. That spring tension is what keeps it from walking off on you the next time you're rolling at 65. And it means a lost or cracked cap turns into a two-minute roof repair instead of a half-day project.

The job of this cap is to let your tanks breathe. Your black and gray holding tanks need a vent so air can move as they fill and drain, and that vent runs up through the roof. The cap sits on top of that pipe and helps draw odors out and away, up off the roof instead of back down into the coach. Keep that vent capped and working and you cut down on the smells that sneak back inside on a warm day. Lose the cap and you've got an open pipe collecting rain, leaves, and whatever else wants to drop in.

Fitment is simple. If your plumbing vent pipe measures 2 inches or less at the top, this cap is sized for it. Most standard RV and trailer plumbing vents fall right in that range. Before you climb up, it's worth taking a tape measure to the outside of your pipe so you know what you're working with. Measure the pipe, not the old cap, because a sun-rotted cap can be warped or swollen and won't give you an honest number.

Install is about as easy as it gets. Clear any debris off the top of the pipe, line the cap up, and press it down until the spring tension grabs. No tools, no sealant, no screws. That's the whole thing. If your pipe is on the smaller side of 2 inches, the spring tension still takes up the slack and holds the cap snug.

Who's this for? Anybody with a travel trailer, fifth wheel, or motorhome who's staring at a bare vent pipe on the roof. It's also smart to keep a spare in the storage bay. These caps are cheap insurance, and the day you notice yours is missing is usually the day you're already parked somewhere without a parts store nearby. One in the toolbox beats a trip to town.

A couple of honest notes. This is the cap only, not the full vent assembly, so if your vent base is cracked or your pipe itself is damaged you'll want to address that separately. And it's a black cap, which looks clean on most roofs but will run a touch warmer in direct sun than a white one would. For the vast majority of rigs, none of that matters. You lost a cap, you need a cap, and this is the right one.

Camco has been building RV and marine gear since 1966, and this is exactly the kind of simple, does-one-thing-well part they're known for. It won't change your life. But it'll keep your tanks venting the way they should and keep the smells where they belong, which on a hot weekend at the campground is worth a whole lot more than it costs.