MOELLER WASTE AND WATER TANKS. Feature nominal wall thickness of 0.300inch. All tank are molded of FDA approved linear polyethylene. Resin meets FDA spec CTF177 1520 requirements. Satisfies all U.S. Coast Guard standards. Provides standard NPT openings for vent 1/2", fill 1-1/2"& drain 1/2". Polyethylene tanks will not filter taste into water or emit waste odors. Exclusively manufactured by Moeller: your leader in innovation design.