Air Operated Diaphragm Pump, Santoprene No stall, high efficiency pneumatic spool valves for long, trouble-free operation. Ideal for chemical transfer and pumping applications. • Double Diaphragm • Ideal for Chemical Transfer & Pumping • High Efficiency Pneumatic Spool Valves • Handles High Viscosity Liquids • Can Run Dry Without Damage • Rated to 10 GPM open flow and pressure from 40 to 100 PSI. • Temperatures to 120° F. • 1/4" air barb with 1/2" & 3/4" liquid barbs are included for ease of plumbing.