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. #1438-8439 slides over and seals around our LPG hose assemblies (except #40407 and 42421) through bulkhead or decks up to 1/2" thick. #1438-8876 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 and BUNA-N sealing gland resists salt water, fuels, weak acids and common solvents.