Double Diaphragm Air Pump PII.75A Chemical Industrial Aluminum 3/4" NPT Inlet / Outlet Double Diaphragm Air Pump PII.75A Chemical Industrial Aluminum 3/4" NPT Inlet / Outlet Polypropylene with Santoprene Diaphragms included Connection: 0.75" NPT 3/4" Good abrasion resistance, chemical resistance, and heat resistance Ideal for use with low viscosity This powerful and efficient air operated diaphragm pump is perfect for all your needs in every industry