The difference is material of O-ring for waterproof.
JR13WR-5P (71)(Discontinued) : NBR (nitrile rubber).
JR13WR-5P (72) : Silicone rubber.
JR13WR-5P (71)(Discontinued) : NBR (nitrile rubber).
JR13WR-5P (72) : Silicone rubber.
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