RP418 and RP818 electric/pneumatic relays are solenoid valves which open and close the air supply to pneumatic controls. The control input is an on-off line voltage signal to the RP418A-C and 24V.AC.signal to the RP818A and B.Features & Benefits"|Pneumatic Selector Relay: Higher of 2 Pressure Relay: Wall- or Panel-Mount
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