Ronco Plastics

The 35H is a pancake: 9 gallons of holding capacity rolled out to 29.75 x 22.5 inches but standing just 8 inches tall. Ronco Plastics draws it this way for underfloor waste service where the frame...

At 30 x 12.5 x 7.25 inches, the 36H is what you spec when the waste tank has to share a bay with everything else: a 9-gallon holding tank barely more than seven inches tall, sized to slip under a...

Nine inches tall and nearly square, the 36W is the pallet-tile of Ronco's line: 16 gallons in a 23 x 21 x 9 inch footprint that covers floor area instead of climbing walls. That geometry belongs...

The 37H is a 36-gallon gray/black holding tank, and like most of Ronco's waste line its exact outline lives on the technical drawing rather than in a headline dimension - print the drawing below, lay...

Seven and a half inches. That is all the height the 37W asks, and it is the least of any tank near its size in the line - 14 gallons stretched across 29.75 x 16 inches of floor. This is the tank for...

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...

The 38W takes 35 gallons and pulls it long: 45 x 18.5 x 11.25 inches. Under a foot tall and nearly four feet end to end, it is drawn for chassis-rail runs, basement bays, and the space beneath a...

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...

Thirteen inches wide, 35 long, 11 tall: the 39W is a corridor tank. It carries 20 gallons in a footprint narrow enough to run beside a wheel well, down the center tunnel of a van, or along the...

Lay a sheet of plywood flat and you have roughly the idea: the 3H spreads 35 gallons across a 64 x 32 inch footprint at just 8 inches tall, the widest, flattest holding tank in this stretch of...

The 3W is one of the oldest shapes in the Ronco book, and the reason is visible in the numbers: 12 gallons at 29.75 x 13.88 x 8.12 inches. That is a tank sized to the voids vehicles actually contain...

Fourteen gallons is where a holding tank stops being a day tank and starts covering a real trip: enough gray water margin for several days of dishes and quick showers for two. The 40H hits that mark...