The Series 130PX pressure switch is field adjustable using ยน/8" allen wrench through the port. Once adjustments are made and the switch is installed, it becomes tamper proof. Features efficient Nega-Rate Belleville disc spring for superior set point stability. Explosion proof, hermetically-sealed electrical assembly, leads factory sealed. (NEMA 4X, 7, 9 and 13). Consult the attached pdf for specifications or contact Teltherm for technical assistance and quotes.