Plumbing – How to split 1/2″ OD male pipe for sink/dishwasher

dishwasherplumbing

(warning, language may be imprecise/wrong)

I'm connecting a dishwasher for the first time. Under the sink I have what I believe is a 1/2" OD male threaded supply line. I guessed this based on the fact that the flexible hose has a label that reads "1/2 OD in to 1/2 FIP out". Please see attached picture.

I thought I would be able to buy a 1/2" inlet to two 3/8" outlets, but my local stores did not carry anything like that. I bought this dual outlet valve, but the fitting was too large for my supply line.

I spoke with two different people at HD, and both of them seemed really confused that my supply line was 1/2" OD. They kept trying to get me to buy the 1/2 FIP again even though I had already tried it.

I tried to buy a 1/2" OD to 1/2" FIP adapter, but couldn't find any at HD.

Thank you.

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Best Answer

OK, so your supply line is not typical (typical would be 5/8" OD copper pipe). Your line is 1/2" OD tubing (sometimes referred to as refrigeration or ACR tubing).

Also not typical (and IMO totally wrong) is the fact that someone has soldered a fitting with 3/8" MIP (male iron pipe size) onto the tubing and forced a flexible supply line with 1/2" compression threads onto it. That would be the flex supply end that was labeled "1/2" OD".

You need to cut off the threaded fitting that is soldered to your line, then install a compression adapter. If you want to use the multi-outlet valve you already have, use a 1/2" compression X 1/2" MIP (male iron pipe size) adapter like this: enter image description here

Of course, this will necessitate using a new flex supply line to fit the outlet size of your valve (3/8" compression).

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