This Spares Kit includes 1) 113V-0 Diaphragm, 2) 160-G-107V Check Valves and 2) 160-A-1200 Sealing Washers, the replacement elastomer part for an Edson Models 120 Power Pumps and Models 117 and 557 Side 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.)