3/4″ x 3/4″ 24v step open gas valve combination gas control for use in 24 vac, gas-fired, standing pilot appliances with capacities from 30 to 300 cfh. controls include safety shutoff, manual valve, two automatic operators, pressure regulator and pilot adjustment. compact size. provide two automatic valves. 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. meets codes requiring dual safety shutoff. natural to lp and lp to natural conversion kits available for standard and slow opening gas valves. all adjustments, wiring connections and pilot outlet are accessible from top of control. adjustable servo regulator effectively maintains almost constant gas output pressure under wide fluctuations in gas supply pressure. compatible with eco connector. lite-rite (off-pilot-on) lighting sequence.