Smith-Cooper International 160 Series Iron Butterfly Valve, Wafer Style, Nickel Plated Ductile Iron Disc, Buna-N Seat, Lever Handle, 2" Wafer-style design for a seal against two-way pressure to prevent backflow in single-direction systems Made of iron for compressive strength and more flexible and elastic than cast iron; Buna-N seats provide high tensile strength and resistant to oil, fuel, and other chemicals Lever handle for manual flow control Maximum pressure of 200 pounds per square inch (psi); Upper temperature range of 150 degrees Fahrenheit. Flanged connection surrounds the body for bolting to pipes