Home › Guides › RV sewer hose guide

RV sewer hose guide: length, fittings, supports and storage

Quick answer: Most RVers use a 3-inch sewer hose with bayonet fittings and carry about 20 feet in total, often as two sections, so they can reach awkward inlets. Add a clear elbow or a sealing adapter for the inlet, a hose support for full-hookup sites, gloves, and a separate non-potable rinse hose.

The sewer hose is the one piece of gear you use every time you dump. A good setup makes dump day quick and clean; a short, cracked or loose one is how spills happen. Here's what to look for and how to use it.

How long should it be?

• Carry about 20 feet. Dump station inlets and campground sewer connections aren't always right under your outlet. Two shorter sections joined with a connector give you reach when you need it.
• Use only what you need. A shorter run drains faster and is easier to rinse and pack. Leave the extra section in the bay when the inlet is close.
• Know which side your outlet is on. Most RV outlets are on the driver's side, which is why dump stations are usually laid out for a driver-side approach. The dump station etiquette guide covers lining up.

Fittings and adapters

• Bayonet fitting: the twist-lock end that attaches to your RV's 3-inch waste outlet. Make sure the lugs are fully seated before you open a valve.
• Clear elbow or inlet adapter: seats the hose end in the ground inlet. A clear one lets you see when the tank is running clear while you rinse.
• Sewer seal (donut): a rubber ring or threaded adapter that seals the hose into a campground sewer pipe. Some campgrounds require one at full-hookup sites.
• Connector: joins two hose sections. Check that both ends lock before you trust it.

Hose supports and slope

Waste needs to run downhill the whole way. At a full-hookup site, where the hose may stay connected for days, a hose support keeps a steady slope so nothing sits in low spots and dries there. At a dump station you're only connected for a few minutes, so lifting the hose by hand at the end to drain it is usually enough.

Hooking up without spills

1. Put on gloves and check that both valves are closed.
2. Remove the cap from the RV outlet slowly, over the inlet if you can, in case a valve leaks.
3. Attach the hose to the outlet and twist until the bayonet locks.
4. Seat the other end firmly in the inlet with the elbow or seal. Some people set a foot or a weight on it so it can't pop out.
5. Open the black valve first, then gray, so the gray water rinses the hose. The full routine is in the how to dump RV tanks guide.
6. Rinse with the non-potable hose, lift the hose to drain it toward the inlet, then disconnect from the RV end first.

Storage and replacement

• Store the sewer hose away from fresh-water gear: a bumper tube, a hose carrier or a dedicated bin works.
• Cap both ends after rinsing so drips stay inside.
• Look for cracks, pinholes and worn fittings before each trip, and replace a hose that leaks or keeps smelling after a rinse.
• In freezing weather, drain the hose completely and don't leave it connected overnight. The winter dumping guide has more.

If you can't pull the RV to the dump station, a portable waste tote uses the same hose fittings to move waste by hand. If the black tank still smells after a good dump, the black tank cleaning guide covers deep rinses and clogs, and the RV tank calculator helps you plan how many days you have before the next dump.

Finding a place to dump

Browse dump stations by state and city, the free RV dump stations by state, or the truck stop and 24-hour lists. The dump station cost guide shows typical fees.

This is general information. Check your RV's manual for its outlet size and fittings, and follow the posted rules at each campground and dump station.

Page built November 6, 2026 · Data from OpenStreetMap (snapshot July 15, 2026). Report a station