Ronco RV Holding Tanks

Forty gallons from a 23.5 x 23 inch patch of floor - the B221 is what happens when a tank gives up on sprawl and builds upward instead. At 23.5 x 23 x 18 inches it is nearly a cube, and cubes are the...

The B220 goes tall where most dual-role tanks go flat: 30.5 x 20.5 x 18.5 inches, 43 gallons. That 18.5 inch height is the number to notice. Deep lockers, cockpit footwells, and vertical chases waste...

At 42 gallons the B237 crosses the line from day-boat convenience into genuine cruising capacity - enough fresh water to keep a family aboard for a long weekend without rationing the galley tap. The...

The side dump is the defining feature of the 6H: the waste valve exits through the side face of the tank instead of the bottom or end, which is how many coaches route their termination plumbing when...

A full 22H is an eighth of a ton of sewage riding your frame: 30 gallons at 8.34 pounds per gallon comes to about 250 pounds, and that number should drive the whole replacement job, from strap...

Same 30 gallons, different arithmetic: the 39H spreads its volume across 46 x 22 inches at only 9 inches tall, while its sibling the 22H stacks it deeper at 39 x 25 x 12. Pick by the dimension your...

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...

The B222 spreads 40 gallons into a 42 x 26.75 x 9.5 inch slab, and that 9.5 inch height is its entire argument. Underfloor bays, shallow bilge flats, and the space beneath RV galleys rarely offer...

The Ronco Plastics B158 puts 36 gallons into 30.5 x 21.5 x 13.75 inches - a squarish, low package that fits under dinette seats and berth flats where longer tanks will not turn the corner. It is a...

The B254 stands its 36 gallons nearly upright: 28.38 x 17.88 x 17.75 inches, as tall as it is wide across the beam. That proportion is the answer for lockers and bays with generous height and stingy...

The B546 runs 62 inches long by 14 wide by 7.5 tall - a plank of a tank that slips 25 gallons into bilge runs and underfloor channels no rectangular-box tank could enter. It is the wider, shallower...