Description: [Materials]: Air compressor pressure switch is made of metal materials and has a long service life, you can use for a long time to use. [Feature]: Pressure switch has good sealing effect, wear resistant and stable, 4hole or 3hole pressure switch has high precision voltage regulation, responsive. [Easy Installation]: Pressure control switch has compact structure, 140psi pressure switch is easy installation, saving time and effort, the four/three port gives you the option to mount in it any direction and to also have the option to add a relief valve, gauge, or multiple air outlet ports. [More Safe to Use]: This pressure switch is designed for a single stage air compressor pumping up to 140 PSI but can be adjusted anywhere from 70-140 PSI. [Wide Application]:The structure of the original air meter can be installed, and the original air release valve has various applications, standard water well pump replacement switch designed for use of electrically driven water well pumps of all types. Specification: Material: Metal Size Chart: 7cmx4cm/2.76inchx1.57inch Package Includes: 1 Air Compressor Pressure Regulator(4 Pack) Note: Please allow slightly errors due to manual measurement and different monitors.