Resideo VS820A1047/U Standard Opening Gas Valve, 1/2 x 3/4 in Connection, 0.5 psi Pressure

These gas controls combine a Lite-Rite manual gas cock, safety shut-off Pilotstat assembly, millivoltage automatic valve operator and optional gas pressure regulator. They require the use of a 750 mV Powerpile generator (thermopile). The generator, heated by the pilot burner flame, provides the electrical energy to operate the combination gas control. A millivoltage thermostat with suitable accessory controls completes the automatic control system for the heating appliance.