End dump RV holding tanks from 9 to 250 gallons that drain from one end, for black and gray water under your RV. Seamless Custom Roto-Molding tanks, listed with full dimensions and molded from FDA compliant resin, ship blank or with a DIY fitting kit.
A new holding tank has to fill the space your old one left and drain where your plumbing expects it. Our end dump tanks from Custom Roto-Molding are seamless, so there's no seam to crack, chip or split.
When a holding tank fails, measure its length, width and height and note which end it drains from, then match a tank that fits the same bay. Every listing gives the full dimensions, so you can compare before you buy.
The outlet sits low on one end, but not always in the middle: Custom Roto-Molding centers it on some tanks and sets it toward one side on others. Measure from the side of your old tank to the center of its outlet so the new dump valve lines up with your sewer line.
Many of our end dump tanks stand eight inches tall or less, built to slide into a shallow space under the floor. Long, narrow models close to nine feet long run along the frame where a wide tank won't fit.
Tanks ship blank or with a DIY fitting kit that holds a deck plate, threaded compression fittings in two sizes, a plug and stainless steel screws, and it works with straight or elbow hose adaptors. Leave room at the dump end for the valve, fittings and hose, since the listed size is the bare tank.
Every tank is made to order and can't be returned, so use the tank finder on this page to match the space you measured, or request a quote if you can't find a fit. Need a different shape? Shop side dump or L-shaped holding tanks.