Global Vacuum is pleased to introduce its' FFKM (Chemraz) exhaust valve and ballast kit for the Edwards nXDS Corrosive Series Scroll Pumps. Made from a Perfluoroelastomer with a continuous operating temperature of 280 C. It is also resistant to over 1,800 chemical compounds and solvents. Save $100's of dollars from the OEM price. Delivery from stock.