Murzan PI 50 Sanitary Pump Model P150-DL. S/N 8906646 This pump is the only diaphragm pump specifically designed to meet the special requirements of the sanitary industry. High efficiency oil free air valve, maintenance free ball check system or flap check valve and total visual inspection of all wetted parts, give the user safe and efficient transfer of foods, cosmetics and pharmaceuticals - USDA listed, FDA approved, the PI 50 Series is manufactured to meet general 3-A Standards.