Directional Control Poppet Valve, Valve Ways and Positions 3-Way/2-Position, Valve Actuator / Return Air Pilot / Spring, Valve Port Size 1/2 in, Center Position Closed, Max. Operating PSI 145 psig, Pilot Pressure 36 psig, Pilot Port Size NPT (In.) 1/2, Max. Temp. Range (F) 23 Degrees to 158 Degrees F, Vacuum External Pilot, Coefficient of Volume 4.8, Length (In.) 2 15/16 in, Width (In.) 2 953/1000 in, Height (In.) 3 31/32 in, Uses Air or Neutral Gas Service