Camco 37420 Flexible Camper Drain, 25-Inch RV Sink Hose

If you've got a small camper or a vintage trailer with a single sink and no holding tank, the Camco 37420 Flexible Camper Drain is about as simple as gray water gets. It's a complete drain system, trap and hose and evacuation flange all in one, built to route sink water straight out the sidewall or down underneath the rig. No plumbing puzzle, no holding tank to manage. Just a clean path for the water to leave.

Here's how it works. The sink end threads onto a standard 1-1/2 inch, 11-1/2 thread drain fitting, the same size you'll find under most utility and camper sinks. From there the gray water runs through 25 inches of 3/4-inch ID hose and out through the ABS evacuation flange. You mount the flange through the sidewall or the floor, and that's your drain. For a teardrop, a truck camper, or an older rig that was never plumbed for a black tank, this is the honest answer.

The parts are chosen for a reason. The drain trap is molded from chemical-resistant polypropylene, so soap, grease, and the usual sink chemistry won't eat it up. The evacuation flange is ABS with UV stabilizers, which matters when it's bolted to a sunny sidewall season after season. The whole system is rust-proof, top to bottom, because there's no metal in the water path to corrode. That's the payoff of an all-plastic drain. It just doesn't rot out on you.

The trap on the sink end does what a trap should. It holds a little water to block odors from climbing back up into the cabin, the same principle as the P-trap under your kitchen sink at home. On a small camper where the sink sits a few feet from where you sleep, that matters more than you'd think. Nobody wants to smell the drain at 2 a.m.

Because the hose is flexible 3/4-inch line and not rigid pipe, you've got some freedom in how you run it. Snake it around a cross member, angle it toward the low side so it drains fully, or pick a flange location that suits the sidewall. Twenty-five inches isn't a huge run, but for a compact camper it's plenty, and flexible beats fighting with elbows and glued PVC joints in a tight cabinet.

A quick word on fit. This is built for campers and RVs with a single sink and no holding tank, where the sink drains directly outside. If your rig captures gray water in a tank, you're running a different setup and this isn't it. But for the simple stuff, a galley sink in a teardrop, a hand-wash sink in a toy hauler, a utility sink in a small trailer, it's exactly right.

One practical note on using it. Since this drains straight out, you're releasing gray water wherever the flange points, so be mindful of where you're parked. At a hookup site you'll want a bucket or a proper drain below it. Boondocking, know the rules for the land you're on. It's the trade-off for skipping a holding tank. Simpler plumbing, but you're responsible for where the water goes.

The flange and cap come in white, the trap and hose in black, so it blends with most exterior panels without looking like an afterthought. Install is about as quick as it gets. Thread the trap onto the sink fitting, run the hose, mount the flange, and you're draining. No special tools, no glue-up on the water side. And it's made in the USA, which is worth noting on a part that lives outdoors and gets used every trip.

Bottom line, it's a cheap, simple, rust-proof drain that solves a specific problem well. If you've got a single sink and nowhere for a holding tank, this is the part you want. Keep a spare in the bin if you camp often, because a drain is one of those things you never think about until the day it splits.