Austenitic Stainless Steel grade 316L for contact product, austenitic SS grade 304 for not contact product, Ra mx 0.8 µm on product contact surface,Seat Valve Teflon (PTFE) ,working operation pressure 1/2 -2 : 1000WOG, Max working pressure 2 1/2 - 4 " : 800WOG, Temperature range (PTFE) -20?C - 150?C