Ronco Marine Holding Tanks

Seventy-four inches long, 10 inches wide, 9 inches tall. The B515 is a keel-run tank: it lays 26 gallons down the centerline of a hull, in the dead space alongside stringers where no boxy tank could...

The Ronco Plastics B491 fits 48 gallons into a 39 x 27.5 x 11.75 inch envelope, under a foot tall. That geometry targets the platform-and-plinth installs, under berths, under dinette seating, under...

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 B545 holds 53 gallons in 30 x 22 x 20.5 inches - a dense, deep-bodied molding that gets serious capacity out of a compartment barely 30 inches on its longest side. Among the mid-size B-series...

Thirty-eight inches long, 8.12 inches tall: the 20W is a plank of a tank. It runs 17 gallons out along a chassis rail or under a bunk in a strip 15.5 inches wide, thin enough to disappear beneath a...

Under eight inches tall. The 72W closes out the slice at 35 x 19 x 7.75 inches, putting 19 gallons into one of the thinnest profiles Ronco molds. This is the tank for the layer nobody sees: between a...

Six and a half feet of tank, eight and a half inches of height: the Ronco Plastics B310 is the B-series at its most extreme - 45 gallons stretched across 78" x 18" x 8.5" to run the full length of a...

The Ronco Plastics B318 is the generalist of the mid-size B-series: 45 gallons at 40" x 19" x 15.62", proportions that fit under berths, behind settees, and across RV bay floors without demanding a...

Narrow spaces get their own tank: the Ronco Plastics B312 runs 72" x 15" x 13", a six-foot rail of a molding that carries 53 gallons along a keel line, a chassis frame run, or the slot behind a rear...

The Ronco Plastics B315 concentrates 52 gallons into a 30.5" x 24.38" x 17.38" block that weighs just 41 lb empty - a capacity-to-weight ratio that makes it one of the easiest big tanks in the...

Fifty-five gallons under 15 inches of height: the B528 spreads its volume across a footprint just over 34 inches long by 28.5 inches wide, so serious capacity fits where a tall tank never could. This...

The 60W is the crossover big tank: 58 gallons at 44 x 22 x 15.5 inches, cataloged for RV and marine service in the same breath. Coach builders stand it in a basement bay; boatbuilders lay it beneath...