Pressure Control Number of Stages 3 Control Air Pressure 3 to 20 psi Differential Pressure (Stage 2 and 3) 0.4 psi (Stage 1) 3 psi Contact Action 3 SPST 1/8 in Barbed Air Connections Max Ambient Temp 140 Degrees F 120-277V AC Height 3 7/8 in Width 4 3/32 in Depth 3 3/16 in Switch 1 - Low Pressure / Switch 2 3 - High Pressure UL / CSA