Camco 39500 Sewer Waste Valve Seal Kit | 1-1/2 in.

Here's a job every RV owner runs into eventually. You go to dump the tanks, and there's a slow drip weeping past the blade valve, or that sewer smell that just won't quit. Nine times out of ten it isn't the valve body that's failed. It's the two rubber seals inside it that have hardened and stopped sealing. This Camco 39500 kit is the fix, and it costs a small fraction of what a whole new valve runs.

A little background on how these valves work. Your RV's gate valve, sometimes called a blade valve, has a flat plastic blade that slides through the body to open and close the drain. On each side of that blade sits a rubber seal that squeezes against it and keeps everything watertight when the valve is shut. Those seals take a beating. Sun, tank chemicals, dried-on gunk, and plain old age make them stiff and brittle over the seasons. Most owners get a few years out of a set before they need attention, though heavy use and harsh dump chemicals can shorten that. Once they lose their squeeze, you get drips, odors, and a blade that's hard to slide. Swapping them brings the valve back to like-new without pulling the whole assembly off the drain pipe.

The kit gives you two fresh seals, one for each side of the blade, made from flexible rubber that grips the blade and holds a tight seal. The rubber stays flexible so it can keep conforming to the blade as you cycle the valve open and shut. Camco includes the mounting hardware you need to bolt the valve flanges back together, so you're not hunting for the right bolts at the hardware store in the middle of the job. It's sized for 1-1/2 inch waste valves specifically, the smaller drain valves you'll find on gray-water lines and some black tank plumbing. It comes as a single kit with bilingual English and French retail packaging.

Install is straightforward and you don't need special tools. Dump and rinse your tanks first, obviously. Then unbolt the valve flange, separate the two halves, and pull the old seals out. They'll usually be flat, cracked, or crusted with buildup. If you want an easy reference for putting it back together, snap a quick photo before you pull it apart. Wipe the mating surfaces clean, set the new seals in place on each side of the blade, line the flanges back up, and torque the hardware down evenly so the blade still slides freely without binding. Snug is the goal, not gorilla-tight. Over-torquing can distort the body and cause the very leak you're trying to fix. Run some water through and check for drips before you call it done.

A quick word on fitment so you order the right part. This is the 1-1/2 inch kit. If your valve is a 3 inch bayonet-style valve at the main sewer outlet, these seals won't fit it, so measure your valve or check the size stamped on the body before you buy. And if the plastic blade itself is scored, warped, or cracked, or the body is damaged, a seal kit won't save it and you'll want a complete replacement valve instead. But for the far more common case of tired seals on an otherwise good valve, this is exactly what you need.

For the money, keeping one of these in the storage bay is smart insurance. A leaking waste valve has a way of failing at the worst possible time, usually at a full campground with a line behind you at the dump station. Fifteen minutes and a couple of fresh seals gets you sealed up and back on the road. If you're not sure whether your valve is the 1-1/2 inch size, or you just want help matching seals to your setup, give us a shout and we'll point you the right way.