Meets ABYC Standard for non-abrasive, non-pressurized, vapor tight seal for a continuous length of LPG supply line passing through water tight bulkheads and decks, including LPG propane locker wall. Three piece nylon construction with lock nut and Buna-N sealing gland resists salt water, fuels, weak acids and common solvents. Properly installed it will withstand up to 70 PSI water pressure and working temperatures of -22deg; to #43;212deg;F. LPG copper tubing (before flare nuts are attached) through bulkheads and decks up to 3/8 in. thick