Marshall Excelsior Adapter Fitting O-Ring

Precision-engineered replacement O-ring for POL (Prest-O-Lite) adapter fittings. This single O-ring maintains a reliable seal in propane and gas transfer connections, preventing leaks and ensuring safe, efficient operation. Fits standard POL quick-connect systems used in RV appliances, heaters, and propane delivery equipment. Replace when worn or damaged to restore pressure integrity and safety. Essential maintenance component for any Airstream or RV propane system.