MSS - Manufacturers Standardization Society of the Valve and Fittings Industry.
Scope
This Standard Practice covers seamless wrought-copper fittings in nominal size 1/8 through 8@ straight and reducing size@ with solder-joint or threaded-end connections@ and for use with copper water tube@ per ASTM B88@ at the pressures and temperatures shown in Table A1. The fittings in this Standard Practice have dimensions and ratings not covered in ASME B16.22. Included in this Standard Practice are: a) Pressure-temperature ratings b) Abbreviations for end connections c) Size and method of designating openings and fittings d) Markings e) Materials f) Dimensions and tolerances g) Testing