Controls include manual valve, 2 automatic operators, servo pressure regulator and pilot adjustment | Solenoid-operated first automatic valve opens on thermostat call for heat, closes when call for heat ends | Diaphragm-operated second automatic valve opens under control of regulator, closes if gas or power supply is interrupted | Size: 5-3/16" H x 4-1/8" W x 3-1/4" D
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