Moeller 20 Gallon Water Tank Moeller Marine has the right fit water tank for your boat or RV. Each Moeller water tank meets FDA specs for polymers used in contact with food, which ensures safe, odor-free water. Each tank features a nominal wall thickness of .20 5 mm. A multitude of waterwaste tank sizes ensures you the right fit for your vessel needs. Feature nominal wall thickness of 0.300 . Resin meets FDA spec CTF177 1520 requirements. Satisfies all U.S. Coast Guard standards. Provides standa