Every boat and van build has one system that gets designed last and crammed into whatever space is left. The B344 is the tank for that space: 7 gallons, 12 lb empty, explicitly listed by Ronco as water or waste so it can become whichever system you ran out of room for. Fresh fittings make it an FDA-compliant potable day tank; waste fittings make the identical molding a compact gray or black holding tank. The blank does not care - your fitting order decides.
Because it ships bare and gets its ports installed to your marks, it adapts to tight geometry that would defeat any pre-plumbed tank. Print the drawing below, use the fitting planner on this page to put the fill, vent, and outlet exactly where your hoses can reach, and Ronco spin-welds or thread-installs them before shipment from Tustin, California - build-to-order, as practiced there since 1974. Just commit to the role up front: a shell that has held waste is never returned to fresh water service.
Full, it weighs about 58 lb - light enough to feel optional to secure, heavy enough to be a projectile in a seaway, so strap it anyway. Kindred small shapes live in boat tanks, the van-build fresh options in RV water tanks, dedicated waste shapes in RV holding tanks, and the full line on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B344 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.
