5" Wafer Check Cast Steel /Stainless Steel with Viton Seat 150/300# Dual Disc Titan CV42CSV5" Wafer Check Cast Steel Stainless Steel with Viton Seat 150 300# Dual Disc Titan CV42CSV 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 shrinkage.