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Old 06-11-2015, 10:57 PM   #1
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Connecting 1" Pex Pipe to 1" poly pipe


OK I give up, I have 1" main water line from well coming through foundation. I want to install 1" Pex pipe to it. From my readings The 1" poly pipe is 1.049 inside dia and 1.189 o/s dia. The 1" pex Inside is 0.862 and o/s 1.125. Any fitting or fittings that will mate both?
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Old 06-12-2015, 12:55 AM   #2
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Originally Posted by mcclure440 View Post
OK I give up, I have 1" main water line from well coming through foundation. I want to install 1" Pex pipe to it. From my readings The 1" poly pipe is 1.049 inside dia and 1.189 o/s dia. The 1" pex Inside is 0.862 and o/s 1.125. Any fitting or fittings that will mate both?
Welcome to the plumbing industry that's had us screwed for over a hundred years and continue the trend.

You may have to resort to having a brass barbed fitting made. Sad isn't it.
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Old 06-12-2015, 01:08 AM   #3
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that or just continue with the poly pipe.
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Old 06-12-2015, 05:50 AM   #4
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Ayuh,.... As far as I know, you'll need a hose barb to threaded fittin', to a threaded to pex fittin',.....
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Old 06-12-2015, 07:51 AM   #5
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Go to a good wholesaler. if they'll sell to you, they will stock a pex x barbed brass adapter. They're pretty common here
Purchase it and a couple hose clamps. Apply a little heat to the poly to soften it slightly. Then insert the adapter in the poly and tighten it down with the clamps.
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Old 06-12-2015, 11:08 AM   #6
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I just did this. I used a poly-thread fitting and a thread-pex fitting. I also stuck a ball valve in between for good measure, not because it was necessary, but just because I wanted one.
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Connecting 1" Pex Pipe to 1" poly pipe-pexpoly.jpg  
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Old 06-12-2015, 02:17 PM   #7
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Go to a good wholesaler. if they'll sell to you, they will stock a pex x barbed brass adapter. They're pretty common here
Purchase it and a couple hose clamps. Apply a little heat to the poly to soften it slightly. Then insert the adapter in the poly and tighten it down with the clamps.
Whats the best way for him to apply the heat to the poly?
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Old 06-12-2015, 02:21 PM   #8
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Whats the best way for him to apply the heat to the poly?
I know a lot of guys use a torach but unless you're experienced, that's sketchy as you can overheat the pipe leading to deformation and leaks. Dipping in a cup of hot water or application of a blow driver (or heat gun on LOW) are a bit safer.
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