Plast-O-Matic PRHM Series Polypropylene Pressure Regulator, For Corrosive and Ultra-Pure Liquids, 5 - 125 psi Regulating range, 1" x 1" NPT Female Converts varying inlet pressure up to 150 PSI, to a stabilized, lower pre-set downstream pressure Protects sensitive downstream instruments, tubing and filters against damage from overpressure/pressure surges; permits the entire system to operate safely and effectively Large surface area of its frictionless rolling diaphragm provides exceptional sensitivity Free movement of the diaphragm on a balanced shaft assures smooth, accurate performance and reliable sealing for millions of cycles Double U-cups prevent leakage along the shaft and eliminates the possibility of "creep"