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MSS SP-81-2021Stainless-Steel or Stainless-Steel-Lined, Bonnetless, Knife Gate Valves with Flanged Ends, Includes Errata (2022)standard by Manufacturers Standardization Society, 01/01/2022
MSS SP-81-2017Stainless-Steel or Stainless-Steel-Lined, Bonnetless, Knife Gate Valves with Flanged Endsstandard by Manufacturers Standardization Society, 04/01/2017
MSS SP-81-2013Stainless-Steel or Stainless-Steel-Lined, Bonnetless, Knife Gate Valves with Flanged Endsstandard by Manufacturers Standardization Society, 05/01/2013
MSS SP-81-2006aStainless Steel, Bonnetless, Flanged Knife Gate Valvesstandard by Manufacturers Standardization Society, 01/01/2006
MSS SP-81-2006Stainless Steel, Bonnetless, Flanged Knife Gate Valvesstandard by Manufacturers Standardization Society, 01/01/2006
MSS SP-81-2001Stainless Steel, Bonnetless, Flanged, Knife Gate Valvesstandard by Manufacturers Standardization Society, 12/01/2001
MSS SP-81-1995Stainless Steel, Bonnetless, Flanged, Knife Gate Valvesstandard by Manufacturers Standardization Society, 01/01/1995
MSS SP-80-2013Bronze Gate, Globe, Angle and Check Valvesstandard by Manufacturers Standardization Society, 03/30/2013
MSS SP-80-2008 ErrataErrata for Bronze Gate, Globe, Angle and Check ValvesAmendment by Manufacturers Standardization Society, 12/03/2012
MSS SP-80-2008Bronze Gate, Globe, Angle and Check Valves (Includes Errata of 12/3/2012)standard by Manufacturers Standardization Society, 01/01/2008
MSS SP-80-2003Bronze Gate, Globe, Angle and Check Valvesstandard by Manufacturers Standardization Society, 11/18/2003
MSS SP-80-1997Bronze Gate, Globe, Angle and Check Valvesstandard by Manufacturers Standardization Society, 01/01/1997