The Bull BBQ (17469) allows you to convert your Bull BBQ propane gas grill into a natural gas grill in less than 30 minutes. Only fits Bull BBQ Angus, Lonestar Select, and Outlaw gas grills. Includes four(4) natural gas valves, natural gas rear infrared back burner orifice (not used for all models) and a natural gas regulator that's been converted. All conversions should be performed by a licensed plumber.