The Ronco Plastics B505 gives 29 gallons a long, low, heavy-walled body: 86 lb of polyethylene shaped to run beneath a berth flat or along a stringer bay, carrying its capacity below the waterline of your storage plan where it costs nothing to live with.
As a dual-role B-series molding it holds both options open until you order. Fresh water fittings produce a potable tank, food-contact PE suited to drinking water; waste fittings produce a gray or black holding tank in the same low profile.
Loaded, budget about 242 lb of water at 8.34 lb per gallon along its length, and support the span continuously rather than at the ends.
Molded in Tustin, California by Ronco Plastics, in business since 1974. Its lighter same-capacity sibling sits nearby in the marine tank collection, the RV holding tank line covers decided waste roles, and the freight cost estimator settles shipping. One Source Plastics is an authorized Ronco Plastics dealer.
Fittings
This tank has a molded shape (see the drawing), so it is sold as a blank tank with no fittings installed. Add the Ronco 3-inch uniseal (F3UNISEAL), a loose pipe-to-tank seal you install yourself, if you need a sealed pipe connection.
Technical drawing: download the Ronco Plastics B505 dimensional drawing - print it to plan your install. Sold blank, with no fittings installed.
