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Old 07-07-2012, 01:38 PM   #1
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Can you go from 3/4 in to 1/2 in back to 3/4 in?


The situation is this - I'm putting in an icemaker valve box through an existing hole in the frame - the hole is about 2 in from the wall joist where I'd be mounting the box. I was thinking of using a copper flex pipe designed for water heater connections to connect the valve box to the existing 1/2 inch pipe under the house. But for that to occur, I'd be going from 3/4 inch water service pipe to 1/2 inch pipe that runs to the icemaker T, then back to 3/4 inch for the flex line, and back to 1/2 inch in the valve box.

Should I be worried about cavitation and pitting of pipe due to all that diameter back and forth?

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Old 07-07-2012, 01:47 PM   #2
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Can you go from 3/4 in to 1/2 in back to 3/4 in?


Keep in mind that the water heater flex has to be accessible.

They do that kind of thing on mobile homes all the time. It looks very hokey, although i'd say the worst thing that would happen is a plumber would laugh at you if one ever saw it.

Why not just buy some soft copper?

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Old 07-07-2012, 01:53 PM   #3
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Can you go from 3/4 in to 1/2 in back to 3/4 in?


You're right - I had already bought the water heater flex line because I wanted the extra sturdyness (I live in a seismically active area), but I think just buying the flexible 1/2 inch is the way to go.

I've only seen the 1/4 inch or 1/8 inch line between the valve box and fridge (outside the drywall), but I've never seen it as part of the piping in the house. Do you think it will hold up if things get jostled around a little bit?
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Old 07-07-2012, 04:33 PM   #4
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Can you go from 3/4 in to 1/2 in back to 3/4 in?


Back in the 50's and 60's when copper was used, they mostly used flexible copper tubing (type L) to plumb water into houses.


It will be fine. Figure out how much you need, and go buy it from a plumbing shop.
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Old 07-07-2012, 05:13 PM   #5
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Can you go from 3/4 in to 1/2 in back to 3/4 in?


If you are saying you are installing an ice maker supply line, all you need is 1/4" flex copper.
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Old 07-08-2012, 10:47 AM   #6
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Can you go from 3/4 in to 1/2 in back to 3/4 in?


Quote:
Originally Posted by rjniles View Post
If you are saying you are installing an ice maker supply line, all you need is 1/4" flex copper.
No, because he's connecting a 1/2" supply to an icemaker valve box, which has a 1/2" inlet.

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