Optimal Connection: Equipped with a 6.3mm unloader valve and a 1/4 inch NPT female connection, our pressure switch comes factory-set with a pressure range of 95-125 PSI. It includes a relief valve to prevent your air compressor from overload. Compatibility: Perfectly designed for both single-stage and two-stage air compressors, this pressure switch supports operations up to 125 PSI. Enhanced Flexibility: The four-port manifold design allows for versatile installation options and the addition of a relief valve, gauge, or several air outlets, enhancing the functionality and usability of your air compressor. User-Friendly Design: Featuring a built-in On/Off metal lever and an easily accessible unloader on the side, this switch simplifies operation. The 4-port base supports straightforward mounting of exhaust valves and pressure gauges. Safety and Reliability: Set to activate the compressor at 95 psi and deactivate at 125 psi, our switch ensures consistent, safe, and dependable compressor