Patay Chemical Diaphragm Hand Pumps. The Patay SD60 chemical pumps can be supplied in a variety of difference permutations, with varying diaphragm materials and internal screw for chemical compatibility. Butyl / 303 A2 Stainless Steel, Butyl / CrNiMo Alloy, Nitrile / 303 A2 Stainless Steel and Viton / CrNiMo Alloy.