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Thread: Connecting 3/8" PEX to a standard water shutoff

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  1. #1
    DIY Member ddmoit's Avatar
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    Default Connecting 3/8" PEX to a standard water shutoff

    Hi folks. I just moved to Tennessee from Michigan. I'm installing an under sink water filter. It's a unit that uses 3/8" PEX on both ends. The connection piece that they gave me to connect to my cold supply is useless for my circumstance. What's the best way to connect PEX to a standard cold water shutoff valve without using special tools? Can I use an old fashioned nylon compression fitting like the ones commonly used for ice maker connections?

    Thanks for your attention.
    Dan in SE Tennessee

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    Plumber jimbo's Avatar
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    yes........

  3. #3
    DIY Member ddmoit's Avatar
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    Do I sense an impending qualifying statement, or am I reading too much into the trailing periods?
    Dan in SE Tennessee

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    Moderator & Master Plumber hj's Avatar
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    What is wrong with the connection they gave you? There is no such thing as a "standard cold water shutoff valve", because there are many types of cold water shut off valves.
    Licensed residential and commercial plumber

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    DIY Member ddmoit's Avatar
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    Name:  IMG_8123.JPG
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Size:  89.0 KB This is what was provided.

    Name:  IMG_8097.jpg
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Size:  57.6 KB This is what I have. It fit my new Delta faucet perfectly. I can add a splitter to the top of the shutoff valve to connect my faucet and the water filter.
    Dan in SE Tennessee

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    Forum Admin, Expert Plumber Terry's Avatar
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    The adapter looks to be 1/2" pipe threads x 3/8" OD.
    Your shutoff is 3/8" comp or also considered 3/8" OD
    You may want to pick up a double shutoff for the wall fitting
    or a 3/8 comp x 3/8 comp x 3/8 comp tee for the top of your current shutoff.

    Last edited by Terry; 11-28-2012 at 02:54 PM.

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    Plumber jimbo's Avatar
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    Quote Originally Posted by ddmoit View Post
    Do I sense an impending qualifying statement, or am I reading too much into the trailing periods?
    No "oh by the way" will follow! The forum requires minimum 10 characters in a reply,...hence the dots.

  8. #8
    Moderator & Master Plumber hj's Avatar
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    quote; No insert is provided. Instructions say to turn compression nut 2 full turns after hand tightning, that seemed way too tight at first try, but hot water side let go within 15 min. flooding kitchen

    You discovered the reason why I NEVER cut the manufacturer's supply lines. I just loop them to use the whole thing.
    Licensed residential and commercial plumber

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    DIY Junior Member 180pilot's Avatar
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    I believe the Pex being so stiff, and wanting to stay curled was putting so much side load on the compression nut, it just felt as if it was getting tight against the sealing ring. At second try, I held the tubing so it was straight into the valve with no side load while tightening nut. All is well so far no leaks. But I'll confirm there were no inserts in the parts kit, nor did the instructions show any for the optional shortening of the lines. 9 days and Delta support still has no answer to my question. If I had it to do again, the unsightly under sink clutter looping of the very long amount of tubing would still be a consideration for me. I would think Delta had done some research on the two different methods before offering the option. I went to local hardware with piece of cut off Pex and tried to force a brass insert into it, it could not be done with just my hand and arm pressure against a hard surface as with the soft poly tubing. Are there special diameters of insert for 3/8 Pex??? If so my hardware store did not know of them.
    Last edited by 180pilot; 01-24-2013 at 03:44 PM.

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