Features: There are two types to choose from:thread NPT 1/4inch and NPT 1/8inch. NPT 1/4inch turn on is 145psi and turn off is 175psi; NPT 1/8inch turn on is 70psi and turn off is 100psi. High accuracy and designed to replace the old one, effectively ensure the normal operation of the automobile system. Tank mount type,direct replacement,perfect match, no need to cut and no more modification required. Easy installation and convenient operation. Fitment: Fits 12V or 24V Applications Ideal For Air Horns,Train Horns,Air Compressors,ect. Specifications: Color: Green Material:Metal Thread: NPT 1/4inch,NPT 1/8inch(optional) Voltage12/24V Current30A ON/OFF NPT 1/4inch:145/175 psi NPT 1/8inch:70/100 psi Package Weight: 50g Package Size: 6 * 3 * 3 cm Package List: 1* Air Pressure Switch