ARO 66605J-344 Polypropylene PTFE Multiport Double Diaphragm Pump, 13 gpm, 100 psi. 5.0 out of 5 stars. 3. $637.60. Air-Operated Double Diaphragm Pump, QBK-25L Heavy Duty Alloy Pneu Membrane Pump - 24 GPM, 1in. Inlet & Outlet, Max 80 ℉ 115PSI for Diesel, Kerosene & Oil Chemical Industrial Use. 5.0 out of 5 stars.