Technical Information: DESIGN: The Permeate Pump is a non-electrical, hydraulically driven pump. It uses a reciprocating positive displacement, single action diaphragm to create dramatic efficiency improvements for RO based water purification. WETTED MATERIALS (PERMEATE SIDE): NSF-listed, FDA-approved thermoplastic, EPDM. NON-WETTED MATERIALS: Stainless Steel, Polypropylene. MOUNTING: The Permeate Pump should always be mounted in a horizontal position (i.e. with its outlet ports facing upwards). If required, a special ABS mounting clip with two (2) #10 stainless steel screws is included. FITTINGS: Nominal port openings fit 1/4" tubing. Optional Jaco and John Guest fittings (both straight and elbow) are also for 1/4", 5/16", and 3/8" tubing.