This 150 PSI pressure switch incorporates entirely new innovations in pressure switch design. They are completely sealed using nautical grade casing and pre-wired to fit any standard compressor or relay. All internal components and the body itself are manufactured in the USA. The switch features a 40 Amp pre-wired relay to make installation a breeze. On top of all this, we got rid of the 1/8 NPT fitting that normal pressure switches come with and incorporated a standard 1/4in NPT one. The quick connects are all standard 1/4in terminals as well. Tested for 20,000 cycles.