Pick up the B101 blank and you learn its character immediately: 109 lb empty for a 38-gallon marine water tank. That is several times the weight of a typical molding this size, and every extra pound is wall. Ronco builds it for boats that work - hulls that pound, bilges that flex, tankage that lives hard - where a light tank cracks and a heavy one simply keeps holding water.
Thirty-eight gallons is real cruising capacity: about 317 lb of fresh water when full, enough for genuine time away from the dock. The material is FDA-compliant polyethylene, molded seamless for potable service, and the same blank can be ordered plumbed for waste duty instead if your layout needs a heavy holding tank - the fittings decide the role.
It ships without fittings installed until you mark them: print the drawing below, mark your fill, outlet, and vent locations, or use the on-page fitting planner, and Ronco's Tustin, California shop - rotomolding since 1974 - spin-welds or thread-installs them to your spec. At this weight it pays to price shipping early via the freight cost estimator. More marine shapes live in boat tanks and on the Ronco Plastics hub. OneSource Plastics is an authorized Ronco Plastics dealer.
Technical drawing: download the Ronco Plastics B101 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.
