3/4" 150 PSI Poly Relief Valve P/N: GG2312034PP Polypropylene, 3/4" Inlet & Pipe Connection, 150 psi max. 302 S.S. spring and EPDM O-Ring, excellent chemical resistance, 1/4" port for pressure gauge pipe plug included. Bypasses excess liquid. Adjustable to maintain control of line pressure at any pressure within the valve's operating range. Selected pressure setting firmly held in place by locknut. Extra large valve passages to handle large flows. Also available in 1/2".