Graco Husky 1050 1 in. Flange Polypropylene Air Diaphragm Pump w/ PTFE Diaphragms & Balls, Polypropylene Seats - End Flange - John M. Ellsworth Co. Inc.
How Do Piston Diaphragm Pumps Work | Universal Pumping
2" Polypropylene Air Diaphragm Pump w/ Teflon Diaphragm — Plating International, Inc.
Amazon.com: Air-Operated Double Diaphragm Pump Pneumatic Diaphragm Pump 3/8" Inlet & Outlet 13L/min 1/4" Air Inlet for Chemical Industrial Use : Industrial & Scientific