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Old 05-19-2011, 07:00 AM   #1
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Question Potable water line Size

I have a 1991 t1750 and am replacing the water heater. Existing lines are partially in tact but not all there so I need to reconstruct them. The existing lines are a grey plastic line and it looks like they say 1/2"OD on them, there is also another 'smudged #' that I can't read. This pipe looks like a smaller diameter than the 1/2 pex I find in the hardware stores. I could replace everything but would rather not.. anyone have any insights? I believe the existing stuff is all flairit connections and fittings.

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Old 05-20-2011, 11:36 AM   #2
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I do not know the what Sunline used back then, however in standard tubing sizes in the range you are looking at:

1/4" OD (Most likely too small)
3/8" OD ("might" be)
1/2" OD ( this you already know)

If you have a pair of calipers you can measure the OD or if you can get to an end of it, use a tape measiure across the end of it.

Hope this helps


PS Home Depot and Lowes does have potable water 3/8" BUT make sure it is hot water rated.

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Old 05-20-2011, 06:21 PM   #3
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The gray stuff is smaller then 1/2" pex and bigger then 3/8. You can join them to pex with "shark bite" fittings.
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Old 05-27-2011, 06:38 AM   #4
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thanks folks.. I picked up a couple of "sharkbite" type fittings to transition from the grey to 1/2 pex.. hopefully that will work.. my choice was 3/8" to 1/2".
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