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What is difference between 437P & 437PR?

The part 437P is half coupling.
 
437PR 437P
  • Suits 437S socket coupling
  • Female threads 2 inch B.S.P (11 T.P.I.), suits 439 Series, 437R Coupling Ring, Single Phase 56SO310 Series sockets, 56C310 Series combinations and SS15 Series suspension switch sockets.
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