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Meets ABYC Standard for non-abrasive and vaportight (non pressurized) seal of continuous length of LPG supply line passing 'Straight-Thru' watertight bulkheads and decks from inside cylinder locker to each appliance. Fits over andseals around 1/4" to 3/8" LPG copper tubing (before flare nuts attached) through bulkheads and decks up to 3/8" thick. 3 piece nylon construction with lock nut & 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 -22° to 212° F.