Natural Diaphragm Pump Model ARO 1 in. (fluid ports) handles high-purity fluids using FDA-approved wetted parts made of pigment-free natural PVDF or polypropylene. This eliminates contamination and chemical reactions. Ice-free air motor won't stall and needs no lubrication. Pump flows up to 47 gpm at 120 psi, and flows suspended solids up to 1/8 in. dia.