RV Holding Tanks

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...

Ronco molds exactly one 28 gallon holding tank, and the 23H is it, sitting alone between the four-shape 27 gallon family below and the rail-equipped 29 above. Solitary sizes usually trace back to a...

Black tanks live a harder life than gray ones - solids, chemicals, long intervals between dumps - and 42 gallons is the size where a black tank stops dictating your travel schedule. The 21H is one of...

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...

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...

The 98H is the heavy one. Where its 25 gallon siblings blank out around the mid-twenties of pounds, this molding weighs in near 40, and in rotomolding, extra weight is extra wall. Thicker sections...

Fifty-three pounds of polyethylene before a drop of water goes in: the 68H is the heavyweight of Ronco's 33 gallon holding tanks, carrying roughly double the material of its siblings. In a rotomolded...

At 47 lb of bare shell, the 85H is the heaviest molding among Ronco's 36-gallon holding tanks - noticeably more polyethylene than the 32 lb 37H or the 27 lb 48H at the same capacity. All three...

Thirty-seven gallons is an oddly specific capacity, and that is the point: Ronco's mold library exists to match coach cavities, not catalog round numbers. The 66H is one of two 37-gallon gray/black...

On a lot of coaches the dump valve hangs outboard, just inside the skirt - and feeding it from an end-dump tank means a rigid elbow that traps waste and eventually leaks. The 61H is molded for that...

Forty-three gallons does not appear in anyone's marketing plan - it appears when a mold is cut to fill a specific coach cavity to the brim. The 88H is that kind of tank: the lone 43-gallon shell in...

Ronco fields five different 45-gallon holding shapes - the deepest bench at any capacity in its waste line - and the 83H anchors it. Five molds at one volume is what almost fifty years of cutting...