Ronco RV Holding Tanks

The B350 is what a compromise looks like when it is done well: 30 gallons in a 33 x 20.5 x 11 inch molding, low enough at 11 inches to slide under berths and floors, compact enough in plan to fit...

The B355 is a plank of a tank: 53.5 inches long, 16.75 wide, and just 6 inches tall, holding 21 gallons in the kind of space that exists along a keelson, beside a stringer, or under the floor channel...

Six inches. That is the entire height of the Ronco Plastics B406, a 60 x 21 x 6 inch molding that still finds 26 gallons by running five feet long. It is the tank for spaces everyone else writes off:...

At 40 x 20 x 10 inches the B424 is a genuine under-bunk tank: 30 gallons spread low and flat so the mattress platform above it barely notices. Ten inches of height is the dimension that matters here...

Some tanks fight the bay; the B437 is shaped for the bay most boats and coaches actually have. At 36 x 18 x 12 inches its 28 gallons ride in the classic double-square proportion - twice as long as...

Eight inches tall. That single dimension defines the Ronco Plastics B480, a 19 gallon dual-role tank spread across a 29 x 23 x 8 inch pancake footprint. It slides under berths, under RV floors, under...

The B430 is a tube of a tank: 22 gallons stretched into a 45.5 x 11.5 x 11.5 inch section that runs along a stringer, down the side of an engine bay, or through the narrow chase under an RV floor...

The 42H is a wall of a tank: 91.5 inches long, 16 inches tall, and only 7 inches thick. Fifteen gallons of holding capacity stood on edge like a panel. Builders spec this shape to run vertically...

Gray water or black water - the 77H does not care, but your plumbing layout does, and that is the decision this tank is usually bought to settle. As a 20-gallon blank with no pre-molded valve...

Ronco molds six different 25 gallon holding tanks, and the 31H is the one to start from when you are mapping the family. Same capacity across the board; what changes is the envelope, and the envelope...

At about 22 pounds, the 95H is the lightest blank among Ronco's six 25 gallon holding tanks, which matters most at installation time, when you are the one holding it overhead in a wheel well with one...

If you sketched a generic RV holding tank from memory, you would draw something very close to the 11H: 37 x 20.25 x 11.5 inches, a proportioned rectangle that fits the classic under-floor waste bay...