PEX pipe follows the sizing as copper with a twist. Copper pipe, if labeled 1/2”, is 1/2” ID and is 5/8” OD. But, the ID of copper changes a little if you’re using “M”, “L” or “K” copper but the OD remains the same at 5/8” OD. So, PEX has the same OD as copper and Shartbite fitting will...