New in box. The Me572 Fill Check Valve Adapter Extension is a high-quality product manufactured by Marshall Excelsior. This adapter is designed to provide a leak-proof seal for filling applications, specifically with a 1-3/4" Acme connection. The extension is a reliable solution for ensuring a smooth and efficient filling process without any leaks or spills. With a sturdy construction and an emphasis on safety, this adapter is a valuable addition to any fuel and energy dispensing system.