The Eastman 5/8-IN OD gas connector is designed to connect most major brands of gas ranges, boilers, and high-usage appliances to a shut-off valve. The connector is certified for use with most ranges and boilers with gas ratings up to 106000 BTUs. This gas connector includes an ArmorBoost EFV (thermal excess flow valve). The ArmorBoost EFV from Eastman is designed to help protect you and your family from catastrophic ruptures or disconnects in your gas line. The ArmorBoost valve immediately restricts gas flow to help protect you from the build-up of flammable gas. The valve will remain activated until the gas line is properly repaired. For added protection, the ArmorBoost EFV features a special fire-safe thermal ring that expands to stop gas flow when extreme temperatures of 350 degree Plus are reached. DuraCoat Epoxy Coating provides extra protection from corrosion, chemical stains from common household products.