The Bull BBQ (17468) allows you to convert your Bull BBQ natural gas grill into a propane gas grill in less than 30 minutes. Only fits Bull BBQ Angus, Lonestar Select, and Outlaw gas grills. Includes four(4) propane gas valves, propane gas rear infrared back burner orifice (not used for all models) and a single-stage propane gas regulator with a standard 18-inch hose and elbow fitting. All conversions should be performed by a licensed plumber.