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1.1 ,This specification covers metal insert fittings and copper crimp rings, or alternate stainless steel clamps, for use with cross-linked polyethylene (PEX) tubing in Nominal Tubing Size (NTS) 3/8 ,, 1/2 ,, 5/8 ,, 3/4 ,, 1, 1 1/4 ,, 11/2 ,, and 2 nominal sizes that meet the requirements for Specification F876 or Specification F3253, or for use with polyethylene of raised temperature (PE-RT) tubing in NTS 3/8 ,, 1/2 ,, 5/8 ,, 3/4 ,, 1, 1 1/4 ,, 11/2 ,, and 2 nominal sizes that meet the requirements of Specification F2623 or Specification F2769. These fittings are intended for use in 100 psi (689.5 kPa) cold- and hot-water distribution systems operating at temperatures up to, and including, 180 ,°,F (82 ,°,C).
1.1.1 ,When used with PEX tubing in accordance with Specification F876, the fittings covered by this specification are intended for use in, but not limited to, residential and commercial, hot- and cold-potable water distribution systems, reclaimed water, fire protection, municipal water service lines, radiant heating and cooling systems, hydronic distribution systems, snow and ice melting systems, geothermal ground loops, district heating, turf conditioning, compressed air distribution and building services pipe.