MSS - Manufacturers Standardization Society of the Valve and Fittings Industry.
Scope
This Standard Practice provides dimensions@ tolerances@ and markings for butt-welding fittings for low pressure@ corrosion resistant applications. This Standard Practice covers only fittings made for use with Schedule 5S or 10S pipe@ for all NPS sizes listed in ASME B36.19M@ except that for short pattern stub ends suitable for use with Schedule 40S are also shown.