Camco 39735 Clear 4-in-1 RV Sewer Extension

If you've ever pulled into a dump station and found the inlet sunk down in a concrete pit below grade, you already know the headache this little fitting was built to solve. A recessed dump station sits lower than the ground around it, and a standard 4-in-1 adapter with an elbow just won't reach down into it cleanly. You end up fighting the hose, propping the elbow at an awkward angle, and hoping nothing shifts halfway through the dump. It's the kind of small problem that turns a two-minute chore into a frustrating mess. The Camco 39735 4-in-1 Sewer Extension is the simple fix for it.

The idea is dead simple. This clear extension raises the attachment height of your 4-in-1 adapter by 3 inches, so the whole connection clears the lip of a recessed inlet and seats the way it should. Three inches doesn't sound like much. But at a below-grade station, that's often the difference between a clean, sealed hookup and a spill you really don't want to deal with. It drops in between your existing Camco 4-in-1 adapter and your sewer elbow, and it locks in place. And because it's a rigid fitting, it holds that added height steady instead of flexing under the weight of a full hose. Once it's seated, it stays put through the whole dump.

We like that the body is clear. When you're rinsing out a black tank, you want to see the water run clean before you pack up and roll out. A see-through extension gives you a direct look at what's moving through the line. No guessing, no popping the connection to check. When the water runs clear, you know you're done. That clear body also makes it easy to catch a slow drain or a partial clog early, before it becomes a bigger problem at the worst possible time.

Installation takes about ten seconds and needs no tools. Pull your elbow off your 4-in-1 adapter, slide the 39735 onto the adapter, then reattach your elbow to the top of the extension. Give the connections a quick twist to lock, and you're set. The bayonet-style connections hold each piece together so nothing works loose under flow. When you're finished at the station, it breaks down just as fast and stows right alongside the rest of your sewer kit. Because it fits any Camco 4-in-1 adapter, you don't have to rebuild your setup or buy new gear to use it. It works with the equipment you already carry in the bay.

So who actually needs one of these? If you camp at parks and stations with recessed, below-grade inlets, this earns its spot in your storage bay. Campground dump stations vary wildly from one park to the next, and you rarely know what you're dealing with until you're backed up to it. Snowbirds and full-timers who move between a lot of different dump stations hit recessed inlets often enough that a 3-inch extension pays for itself in saved aggravation. If your home base always has a flush-mount inlet right at grade, you might not reach for it often. But it's cheap insurance to keep one on hand for the station that catches you off guard on a travel day. Keeping one in the bay means you're ready for whatever the next park throws at you.

One thing to be clear about: this is an extension only. It fits between your 4-in-1 adapter and your elbow, and it doesn't replace either one. It doesn't include a 4-in-1 adapter or an elbow of its own, so you'll want to already have those in your kit. Think of it as the piece that makes the gear you've already got work at the stations that would otherwise give you trouble.