5" Wafer Check Ductile Iron /Stainless Steel with Viton Seat 150/300# Dual Disc Titan CV41DSV5" Wafer Check Ductile Iron Stainless Steel with Viton Seat 150 300# Dual Disc Titan CV41DSV Minimal Head Loss Quick Closure to Reduce Water Hammer Resilient Soft Seats VITON PROPERTIES: Offers a broad range of chemical resistance and excellent heat resistance. Good mechanical properties and compression set resistance. Often used in applications where nothing else will work. Fair low temperature resistance and limited hot water resistance and