To alternately apply pressure to and exhaust pressure from a valve double acting actuator. 4 way 5 port 2 position solenoid valve. Single Solenoid Spring Return, Pneumatic Return, Double Solenoid Bistable. Aluminum, Brass or Stainless Steel Body (option available), Connections from 1/4″ to 1/2″, Wide Range of Pressure from 15 to 150psi, Buna N and Viton seats and seals. Standard or Teflon Coated for dried air.