L-shaped RV holding tanks from 10 to 43 gallons that wrap around a wheel well, frame rail or other obstacle to use space a rectangular tank can't. Seamless Custom Roto-Molding tanks molded from FDA compliant resin, shipped blank or with a DIY fitting kit.
Under an RV floor, the open space is rarely a clean rectangle. An L-shaped tank from Custom Roto-Molding wraps around what's in the way, so you gain gallons without moving a wheel well or a frame member.
The two legs of an L-shaped tank meet at a right angle, so the tank can wrap around a wheel well, a frame member or another tank and still reach the space beside it. Where a rectangular tank would leave that corner empty, the second leg turns it into capacity.
Match the overall length, width and height on each listing first, then measure the length and width of each leg on your old tank, since the overall size alone doesn't fix the shape of the L. Include those leg measurements when you request a quote, and we'll help you confirm the fit.
Every L-shaped tank here drains from the end of one leg, so plan the dump valve and sewer hose run from that end. It works as a black tank under the toilet or a gray tank for sink and shower water, and it ships blank or with a DIY fitting kit so you place the inlet and vent fittings where your plumbing needs them.
Each tank is made to order and non-returnable, so measure twice and check your numbers with the tank finder on this page, or request a quote. Need a straight tank or a fresh water tank instead? Shop end dump or side dump holding tanks, or RV water tanks.