This manifold door assembly (part number 100093991) is for water heaters. Manifold door assembly 100093991 connects the burner to the gas supply tube and holds the burner in place. The assembly includes the manifold door, pilot burner with thermocouple and the high temperature sensor. Additional parts may also be included, but the burner doesn?t come with this assembly. The gas supply line connections must be checked for leaks after installing this part.