This Spares Kit includes 1) 113V-0 Diaphragm, 1) 160-G-107V Check Valves, 1) 160-G-108V and 2) 160-A-1200 Sealing Washer, the replacement elastomer part of an Edson Models 554 and 638 Bottom Inlet One Gallon Per Stroke Manual Pumps. Viton® is a DuPont fluoroelastomer with good dynamic strength and excellent heat resistance (400°F/200°C). It is formulated to resist the effects of aromatic hydrocarbons and a variety of very aggressive fuels and chemicals. (Viton® is a registered trademark of E. I. DuPont.)