This membrane is GE 18 GPD fits: FX12M, AG1812TAE, 1616426 and more....Pentair®/GE Osmonics® 24 GPDThin Film Reverse Osmosis MembraneTFM-24Model #:NSF® CertifiedNSF 58 Certified Average NaCl Rejection: 98%Permeate Flow @ 65 PSI 18 GPDSpecifications are based on 500 mg/L NaCl solution at 65 psi net pressure (4.1 bar), 77°F (25°C), 15% recovery after 24 hours. Individual element flux may vary ± 15%.