Features: Brand new and high quality This pressure switches features a 6.3mm unloader valves connection and a NPT1/4 Female connection. The factory-set cut-in and cut off pressure ranges is 90-125PSI/140-175PSI. With a relief valves, it can avoid the overloads operation of the air compressor. It is designed for use with a single stage or two stage air compressor that pumps up to 175PSI. The 4 port manifolds gives you the flexibility to mount the switches in any direction and add a relief valves or multiple air outlet ports. The built-in metal lever and unloader located on the side of the switches allow you to easily cut off air compressor and 4-port base simply the mountion of exhaust valves and pressure gauges. This switches comes presets to turn the compressor on at 140psi and shut off at 175psi, providing reliable operation. Specifications: Material:Plastic Type:Single Port/Four Port Pressure:90-125PSI/140-175PSI Pressure adjustment ranges: 2.0-13.0. Pressure adjustment ranges: 1.5-4.0 Factory setting: 4.0-12.5 Voltage/current: 20A/120VAC 12A/240VAC. Contact mode: normally closed Interfaces standard: 1/4.3/8NPT internal screw or external screw (LF10-1H) 4X1/4NPT internal screw (LF104H) Size:Approx.9.4x9x7.8cm/3.7x3.54x3.07inch Package Includes: 1 Set Pressure Control Switches note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.