For electrical operation of pneumatic actuator on/off functions, Flow-Tek 4-way solenoids are direct mounted to the actuator by NAMUR interface, with no external tubing required. both waterproof (NEMA 4) and explosion proof (NEMA 4,7,9) housings are standard. NPT and IP65 DIN connections are offered with both single and dual coils. The air supply connection is 1/4" NPT and the electrical connection is 1/2" NPT. A manual override lever is located on the top of the valve body. A 3-way solenoid is also available.