Turn on the air pressure switch if the pressure is below 90psi, turn off reach 120psi Lifespan: 100000 cycles, long life, please email the seller if any problem. 1/4-18 NPT male thread: Single connection air tank/ train/air horn, air pressure switch DC pressure switch: 24v pressure switch, 12v pressure switch, AC 110V 120V 240V air pressure switch. Multipurpose air pressure switch: Such as for air horn/train, air tank pressure switch 1/4" NPT male thread: Quick connection, easy to use and no special need for fixing. 90 PSI ON/120 PSI OFF: The pressure switch automatically turns it on when the pressure is below 90 PSI and turns it off when the pressure reaches 120 PSI. Suitable for DC/AC Power: DC 24v pressure switch, DC 12v pressure switch, AC 110V 120V 240V etc air pressure switch. Versalite Usage: train/horn pressure switch, air tank pressure switch, suspension system air pressure switch etc. Product packaging: 1pc 90-120 PSI air compressor pressure switch. Notice: 1. Due to different monitors and lighting effects, the actual color may be slightly different from the picture. 2. Due to manual measurement, please allow deviation in length.