Control Thermostat, Fuel Type Natural Gas, Compatible Manufacturer Part Number 42VP75FW, Inlet Connection Size 1/2 in, Inlet Connection Type NPT, Maximum Heating Capacity 50, 000 BtuH, Outlet Connection Size 3/4 in, Outlet Connection Type NPT, Compatible Grainger Part Number 2LAD1, 6FGV3, 6FGV4, For Use With 2LAD1, 6FGV3, 6FGV4, Maximum Temperature Control 170 Degrees F, Standards California Proposition 65. This item has been restricted from sale in the following state (s): []