ABYC-compliant, vapor-tight way to lead LPG hose and copper tubing lines through propane lockers, decks and bulkheads. Three-piece nylon fitting has a Buna-N rubber sealing gland. Install over LPG and copper line assemblies with fittings attached. Large fitting accepts LPG hoses up to 5/8"OD and installs in bulkheads up to 1/2" thick. Small fitting accepts copper tubing from 1/4" to 3/8"OD and installs in bulkheads up to 3/8" thick.