The Vulcan Hart 00-418051-00057 Range Hood Orifice helps regulate gas flow for consistent burner operation and proper heat output. This brass orifice is designed for range hood applications and features a 3/8"-27 connection with a 1/2" body size and a No. 57 opening. It works by controlling the amount of gas delivered to the burner, supporting an appropriate fuel-to-air mixture for st... https://partsfe.ca/orifice-57-for-vulcan-part-00-418051-00057