Resideo 390427E Two 3/4" X 1/2" Reducer Bushings

The Resideo 390427E Reducer Bushing is a gas control component used to change pipe connection sizes in combustion and heating system installations in HVAC systems. It is placed on combination gas valves and related fuel train components in furnaces and other gas-fired equipment, where it provides a gap between 3/4-inch and 1/2-inch NPT-threaded connections. It is used during installation and prevents proper fitting between gas supply piping. It operates as a mechanical fitting component in the gas delivery assembly, supporting protective threaded connections that help maintain system integrity and proper fuel flow to the burner section.