Air Compressor Pressure Switch Replacement Valve With Unloader For Four Port Systems 145 To 175 PSI Black Durable Control Unit Fits One Quarter Inch NPT Port And Replaces Furnas Square D H4 Compatible Models For Home Shop Use

Air Compressor Pressure Switch for Four-Port Systems
✔️ 1-unit pack, 145-175 PSI range, 1/4 in NPT, unloader

The four-port pressure switch is a compact control valve used to regulate air pressure in four-port air compressor setups. It includes an unloader function to vent pressure when the unit stops, improving startup and reducing motor wear in home shop systems that use 1/4 in NPT piping.

✅ Four-port pressure switch with unloader for 145-175 PSI range
✅ 1/4 in NPT port fits common home/shop lines
✅ Durable black control unit for four-port systems
✅ Replaces standard control valves in compatible models for easy upgrade

💡 What is an air compressor pressure switch used for?

It controls start/stop cycling and unloads pressure for a safe, handy operation in home shop systems.

- regulates cycling pressure for safe operation in a 145-175 PSI system - unloader feature reduces motor wear by venting pressure at shutdown - compatible with 1/4 in NPT ports in four-port air compressor setups