Uni-body Ball Valve, ANSI Class 150 or 300, Flanged Ends, Valves meet specifications as set in NACE MR-01075 and MSS-SP-72, Available Sizes (1/2" - 6"). Materials: Body & Ball Retainer: Stainless Steel ASTM A351/A744 GR. CF8M, Ball & Stem: Stainless Steel ASTM-A276 Type 316, Seat: 15% Glass Filled PTFE