One of the best pressure switches on the market. 12 volt systems only – up to 40 amps. Turns your compressor on when pressure goes below 165 PSI, and automatically turns off once pressure reaches 200 PSI. Moisture resistant, and tested to last over 10,000 cycles. Comes with 1/8″ male NPT port fitting. Leads are pre-fitted with insulated 1/4″ male push-to-connect terminals that are marked. Dimensions : 4.25″H x 2.25″W. Sold by each.