WATER AND WASTE TANKS. 29.5"L X 16.63"W X 12.75"H. Moeller offers an extensive line of water and waste tanks to meet all size requirements. All tanks are molded of FDA approved linear polyethylene, which meets the CFR 177.1520 criteria. Waste tanks feature a heavier wall thickness for strength, and a 3รท inspection port on larger capacity tanks for your convenience. The standard NPT openings accommodate our hose adapter kit (sold separately). Use the custom fitting kit to change the location of the fittings.