RV Holding Tanks

Mold number 105 tells you something before the specs do: this is one of the late additions to a holding-tank library that Ronco has been expanding since 1974, cut because installers kept hitting a...

Twenty-nine pounds is all the 75H asks you to lift into position - the lightest shell on Ronco's five-deep 45-gallon holding bench, and a genuine difference when you are flat on your back under a...

Twenty-one gallons is a between-size, and that is exactly why the 78H exists. The 20 gallon class below it is crowded and the 25 gallon class above it is crowded, but if your coach came with a 21...

Twenty-four gallons is a size Ronco molds exactly once, and the 67H is it. RV floor plans cluster their waste tanks at 22 and 25 gallons, which leaves the 24 gallon coach owner staring at near-misses...

Sizing a replacement holding tank is a one-way ratchet: you can plumb a bigger tank into a smaller role, but never the reverse, and the 38H's 32 gallons make it the step-up candidate when your old 30...

Ronco keeps four different 33 gallon holding tanks in production, and the 15H is the first stop in that family. Thirty-three gallons is fifth-wheel and Class A territory, the gray tank that has to...

Somewhere there is a fifth wheel sitting dead in a storage yard because its 33 gallon gray tank split and the manufacturer went under in the last downturn. The 79H is the kind of molding that revives...

The 20H combines two packaging tricks in one molding: a side dump, with the waste valve exiting the tank's side face, and a long shallow body, 63 x 20.25 x 8.5 inches, that carries 34 gallons under...

The 4H solves a specific plumbing problem: a 35-gallon waste tank that dumps out the side instead of the end. On coaches where the termination valve sits outboard of the frame rail, a side-dump...

The 55H buys its 39 gallons with floor area instead of depth: 49 inches long, 24 wide, 10 tall. That low-slung geometry keeps a full waste load - roughly 325 lb of gray or black water - riding close...

Replacing a failed gray tank in a coach nobody makes parts for anymore is mostly a matching problem, and that is what a four-deep bench of 40-gallon shapes is for. The 71H is one of Ronco's four...

The 46H spends its 13 gallons on area instead of depth: a 52 x 30 inch slab standing only 8 inches tall. That two-and-a-half-foot width is unusual in the holding line and it exists for wide, shallow...