This is a kit that will enable a conversion from Propane  to Natural Gas on the Thermador SGSX365. The factory fuel regulator can be switched between 10"WC for Propane (LP) to 5" Natural Gas. This unit has 5 topside ,burners with three different heat ratings as follows; Left Rear and Right Front (1 each) are rated at 12,000 BTU, center (1 burner) at 15,000 BTU, and Left Front and Right Rear at 8,000 BTU.