Ronco Plastics

The 41H is built around its outlet: a 12-gallon holding tank with a side dump, meaning the waste valve exits the sidewall rather than the bottom. On rigs where there is no clearance below the tank...

The 41W is the tank you buy when the space came first: 17 x 12.75 x 10 inches, 8 gallons, roughly the volume of a milk shipment. It fits standing up in a cabinet, lying down in a drawer bay, or...

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...

Note the empty weight first: 75 lb. For a 58 gallon tank measuring 46.75 x 20.75 x 15.5 inches, that number means one thing - wall. The 42W is molded thick, the way Ronco builds tanks that will spend...

The 43H runs 81 inches along a frame rail while standing just 7.75 inches tall and 11 inches wide - 20 gallons of holding capacity shaped like a structural member. Rail tanks like this are how...

Four feet ten inches of tank. The 43W runs 58 x 20 x 13 inches, laying 58 gallons out in a single long rail that follows a chassis frame, a bus bay, or the length of a keel. Where its square-format...

Nearly seven feet of tank. The 44H runs 80.75 x 14 x 6.75 inches - a 12-gallon holding tank stretched into a beam that lays along a frame rail or under a full-length slide floor where nothing...

A 34 x 34 inch square, 13 inches deep, 58 gallons: the 44W is the platform tank. Perfectly square footprints are rare in this catalog, and they exist for one layout - the dedicated equipment bay or...

Six feet two inches of tank, eight and a quarter inches tall. The 45H spreads its 25 gallons across a 74 x 15 x 8.25 inch envelope, which is the geometry of an underbelly installation: slung low...

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...

The 47H anchors the large end of Ronco's mainstream holding tank boxes: 43 x 22 x 11.25 inches, 27 gallons, the sort of tank that serves as the black tank under a full-time couple's fifth wheel. The...

The 47W hits the capacity most mid-size coach builders actually calculate for: 41 gallons, molded at 36 x 23 x 13 inches. Three feet long, under two wide, one foot one high - it is proportioned to...