Air Pressure Switch Tank Mount Type 1/8'' NPT 70-100PSI 12/24V for Train/Air Horn Air Compressor 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) Voltage：12/24V Current：≤30A 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