5" Wafer Check Ductile Iron /Stainless Steel with EPDM Seat 150/300# Dual Disc Titan CV41DSE5" Wafer Check Ductile Iron Stainless Steel with EPDM Seat 150 300# Dual Disc Titan CV41DSE Minimal Head Loss Quick Closure to Reduce Water Hammer Resilient Soft Seats EPDM PROPERTIES: Probably the most water resistant rubber available. It has good resistance to mild acids, alkalis , silicone oils greases, ketones, alcohols and other polar solvents. It is not recommended for use with petroleum oils, di ester lubricants, mineral oils, non polar