1.5 INCH ARO ALUMINUM DIAPGRAGM PUMP Stock Number: P-2342 ARO 1.5 inch aluminum diaphragm pump Model 666150-362-C Poly seat, Acetyl ball, Nitrile diaphragms Rated to 90 gpm, 1.5 inch in & out Air powered (1) available Posted in Pump, Diaphragm.