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Thread: Replacing DW - discovered 1/4" PEX under sink?

  1. #1
    DIY Junior Member Cross-Eyed Cat's Avatar
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    Default Replacing DW - discovered 1/4" PEX under sink?

    Hi All,

    I'm awaiting delivery of a new dishwasher, and was looking to see what I would need to make the swap. Instructions for the new one call for a 3/8" OD supply line. When I looked under the sink, I found that coming up from the floor are what I believe to be 1/2" CPVC lines. Hot side is topped with a Brass Craft stop, which is then immediately topped with a brass tee that sends a 1/4" PEX straight up to the faucet, and another 1/4" PEX to the left for the DW. (Photo attached).

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    Is 1/4" PEX normal for a kitchen sink faucet supply? Seems too small?

    Is there any easy way to tell what the size of the outlet side of the top is? If it is 3/8, then I presume I could get a 3/8 x 3/8 x 1/4 tee and leave the faucet at 1/4 while upsizing the DW line. But if that outlet is only 1/4, would I be stuck with having to replace the stop? THAT would make me nervous, as this is coming up from a slab and I DEFINITELY do not want to break anything near the concrete level, especially since the old DW worked fine with everything as-is ... so, maybe I'm just making unnecessary work?

    Any advice appreciated!

    Susan

  2. #2
    In the Trades mtcummins's Avatar
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    Looks like you have a tee with 2 3/8" compression fittings. The best thing to do, IMO, is remove both of these water lines and buy yourself the appropriate length braided stainless steel flex connectors. You can find them labeled in the home store for a dishwasher and for a faucet. Usually the only 2 variables will be the connection size to the shutoff (either 3/8" or 1/2", most, including yours from the look of it, are 3/8"), and the length of the line. If its labeled for a dishwasher, it should have the appropriate end connection or an adapter to make the connection to the d/w. The faucet end of those lines is standard size, any that's labeled for a faucet should work. Just don't get one of the "toilet" ones or something and you'll be fine.

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    DIY Junior Member hhplumbing's Avatar
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    As mtcummins said, I would pick up a DW braided supply (we normally sell the brasscraft B1-72DW 6ft line). Now from that picture that really looks to be a 3/8" retro tee and if it is, all you need to do is take off the pex line going to the DW and thread on the braided supply by taking off the nut and metal sleeve.
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  4. #4
    DIY Junior Member Cross-Eyed Cat's Avatar
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    I know those look like they might be 3/8", but the PEX lines coming out of them have 1/4" printed on them, which is why I am thinking that they are 1/4" -- in which case, I can't attach a 3/8" flex, right?

    Thanks!
    Susan

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    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    There 1/4" ID and 3/8" OD.
    John

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    OH! Thank you so much!! A little ignorance goes a long way. That makes everything so much simpler. I would like to add a separate shutoff for the DW so I won't have to lose the hot water in the sink just to isolate the DW, but looks like I can do that right at the tee by adding a 3/8" straight 1/4-turn stop to the left.

    Susan

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    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    Moderator & Master Plumber hj's Avatar
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    You can use a John Guess "slip connection" ball valve in the line. Just cut the hose and push it into both sides of the valve.
    Licensed residential and commercial plumber

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    DIY Junior Member hhplumbing's Avatar
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    What I would do is find the tee in the picture below and replace it with the tee you have installed. just make sure you get the one thats 3/8" x 3/8" x 3/8"

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