Trident Straight Thru-Fitting for LPG Line. Meets ABYC Standard for non-abrasive, vapor tight (non-pressurized) seal of continuous length of LPG supply line passing "Straight-thru" water tight bulkheads and decks from inside cylinder locker to each appliance. Fits over and seals 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 .