These are high quality, easy to use connectors for PE hoses. The measurement given is the OD of the pipe. I ran 1/4" PEX through my attic to pump filtered water back from one room to another. "1/4" PEX is the inside diameter and the outside diameter is 3/8" so they fit. PEX has a much thicker wall than some other polyethylene pipes. I used about half the fittings to turn the water on several Disconnecting spots from my filter.None of them have leaked out yet.The mounting clips that are included are a nice touch.Also, buying this kit is a lot cheaper than buying the parts individually at your local hardware store.
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