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Old 02-13-2015, 10:16 PM   #1
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Mixing type M and L copper pipe


Evening folks. Spent most of my life growing up on a well with a neutralization system to combat acidic water. Because of that experience I've always been told to use type L copper pipe for indoor work.

Flash forward to today where I own a house on city water. I don't know the PH but I would expect it to be closer to neutral. For my bath reno I went out and bought type L copper pipe like I always have. I came home and noticed that the whole house is done in type M. I know the fittings are the same between the types, is there a problem mixing the types? I suppose M has a slight restriction but I doubt it will be a real issue in real world performance.

I can't find anything in the codes that says I can't mix them was just wondering if there is something I'm overlooking.
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Old 02-13-2015, 10:39 PM   #2
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No problem mixing them. They are sized by outside diameter so all the fittings will work on both.
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Old 02-14-2015, 12:02 AM   #3
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Ok. I knew they would join up. Just wanted to make sure that there isn't some kind of nuance that I wasn't aware of.
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Old 02-14-2015, 05:36 AM   #4
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No problem what so ever---glad to see you choosing the thicker type L---
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Old 02-14-2015, 10:15 AM   #5
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Thank you both. Time to start soldering!
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Old 02-14-2015, 12:01 PM   #6
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Go to a pool store and you can buy pH testing kits. Then you will know exactly what the pH is!
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