Patay SD45R20 Pump. Manufactured P.T.F.E bodied pump has been designed to handle a range of aggressive chemicals such as Sulphuric Acid (50 – 99%), Nitric Acid and Hydrochloric Acid. Patay SD45R20 Chemical Diaphragm Hand Pump was designed  for base mounting with a P.T.F.E body, hastalloy internal screw and viton diaphragm.