One Piece Injection Molded PVC, CPVC or GFPP Body;PVC, CPVC or GFPP Disc Materials;Hand Lever with 19 Lockable Stop Positions & 360 Degree Interlocking Splines;External Disc Position and Flow Indication;Hydro-dynamic Centric Disc for Increased Flow Performance;Over-Sized Liner Face Maximizes Surface Contact with Flanges;1-Piece 316 Stainless Steel Stem with Threaded Retaining Gland;Stem Bearing and Seal Retainer for Absolute Stem Position and Seal;ISO 5211 Top Flange and Stem Drive;All Sizes Meet ANSI B16.10 / ISO 5752 Narrow Face-to-Face Dimensions;Pressure Rated at 150 PSI/10 Bar in All Sizes @ 70 DegreeF Non-Shock;NSF / ANSI 61 and NSF / ANSI 372 Listed