Round out the B-series with its steady workhorse: the B137, a 20-gallon marine water tank in a 24 lb blank - the capacity most small cruisers actually need, in a build weight one sailor handles alone. Twenty gallons runs a weekend's galley and washdown with margin, which is why this size never leaves the catalog.
It is molded seamless in FDA-compliant potable polyethylene for drinking water service, and like its siblings it is a dual-role blank at heart: order waste fittings and it becomes a 20-gallon holding tank instead. It ships plumbed for neither - your fitting order is the fork in the road. Full, figure about 167 lb at 8.34 lb per gallon, strapped to structure like everything aboard.
Ronco has rotomolded in Tustin, California since 1974, installing every fitting per order: print the drawing below and mark where the spin-weld or threaded fittings belong, or place them on the on-page fitting planner as you order. Compare it against the rest of the family in boat tanks, cousins for land duty in RV water tanks, and the complete line on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B137 dimensional drawing - print it to plan your install and mark exactly where you want fittings located; Ronco installs spin-weld or threaded fittings to your marked spec.
