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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. Slides over and seals around our LPG hose assemblies (except #40407 & 42421) through bulkhead or decks up to 1/2" 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. Cut 1.35" hole to install.