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

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    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.

  7. #7
    DIY Member ddmoit's Avatar
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    The triple 3/8 tee is what I ended up doing. I'm just concerned about the PEX compression fitting holding. I used a nylon ring, properly installed. I suppose it's no worse than the line going to the new Delta faucet. A leak would be bad in a hurry though.

    Name:  IMG_8124.jpg
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    Dan in SE Tennessee

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    Forum Admin, Expert Plumber Terry's Avatar
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    They make inside sleeves for the tubing too.

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    DIY Member ddmoit's Avatar
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    Yeah, I actually have one. In all the excitement of putting it together, I failed to use it.
    Dan in SE Tennessee

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    Retired Defense Industry Engineer jadnashua's Avatar
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    The inside sleeve provides a hard, smooth, round surface to support and mold the pex so the compression fitting will hold and seal properly. It is included for a reason, you should use it! The connection will be much more robust.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  11. #11
    Moderator & Master Plumber hj's Avatar
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    The connection Tee they gave you was to go between a "flexible hose" supply line and the 1/2" MIP threads on most conventional faucets. Delta, because of their DST versions no longer uses the MIP connection which is what caused your difficulty. The "Add-a-Tee" adapter you used is what I would have used also.

    Last edited by Terry; 11-28-2012 at 02:54 PM.
    Licensed residential and commercial plumber

  12. #12
    DIY Member ddmoit's Avatar
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    Thanks for all the input. Jim, I'll add the sleeve. I have a dishwasher to install in a few days, so I'll be under there again.
    Dan in SE Tennessee

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    DIY Junior Member 180pilot's Avatar
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    Default Delta supplys no insert for DST Pex faucet installation?

    Quote Originally Posted by hj View Post
    The connection Tee they gave you was to go between a "flexible hose" supply line and the 1/2" MIP threads on most conventional faucets. Delta, because of their DST versions no longer uses the MIP connection which is what caused your difficulty. The "Add-a-Tee" adapter you used is what I would have used also.

    Installed new Delta DST kitchen faucet, and because supply lines were so long, I cut off the manufactured ends and opted to use the nylon compression rings supplied with the kit to 3/8" angle stop valve 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. I then retightened to much tighter and then removed tubing to see that nylon compression ring was crimping tubing. And did a pull test. I installed ring in correct manner and deburred end after cutting with standard tubing cutter. It's holding now, but I can't find any recommendation to use an insert inside Pex tubing except on your site here?????? It seems standard practice with softer polybutylene?????? A call to Delta, just produced a woman trying to blame me for not cutting tubing correctly!! I'm an aviation mech. and have been making tubing connections for 40 yrs. Tubing was cut square and deburred. Connection makes me nervious, I always turn off my outside incoming water valve when I leave home, because all my plumbing is 20 yrs old....
    Last edited by 180pilot; 01-15-2013 at 11:03 AM.

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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.

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    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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