Camco
If your RV has a holding tank, a sewer hose connects it to a dump station or site sewer connection so you can empty the tank. If you already own a hose in good shape with the right fittings, you do not need another.
RV owners who empty their own tanks.
Length in the title: 20 ft. Confirm on the Amazon listing before you buy.
Camco RhinoFLEX 20 Ft RV Sewer Hose Kit with Flexible Sidewinder Support – Includes 4-in-1 Adapter, Clear Elbow and Caps – Fits 3” Slip and 3”, 3½”, 4” Threaded Connections (ASIN B0FBNNS9Q4). Amazon's page has the current price, specs and reviews.
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Check current Amazon listing (ASIN B0FBNNS9Q4).
Fine print: The Dude has not personally tested this product. The details on this page come from the Amazon listing and can change; check the listing for the current specs, price and availability.