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Old 11-13-2017, 04:35 PM   #1
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New PEX pipe over old brass PEX fittings


The old "1/2" male brass connections on fittings and ball valves in PEX piping in my house are a larger diameter than newly purchased ones.

Today I bought PEX crimping and cutting tools, 1/2 inch Sharkbite tubing, copper crimp rings, and a 1/2 inch Sharkbite brand brass ball valve to replace a leaking ball valve in a home I just purchased. No problem installing the new pipe to the new valve which had male PEX-type connections. However, I could not force the new PEX pipe over the male ends of the old copper fittings and ball valve, particularly when I first put the copper crimp rings near the ends of the new pipe. What has changed and what is the work-around?
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Old 11-13-2017, 04:41 PM   #2
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Re: New PEX pipe over old brass PEX fittings


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Originally Posted by pbgvdad View Post
The old "1/2" male brass connections on fittings and ball valves in PEX piping in my house are a larger diameter than newly purchased ones.

Today I bought PEX crimping and cutting tools, 1/2 inch Sharkbite tubing, copper crimp rings, and a 1/2 inch Sharkbite brand brass ball valve to replace a leaking ball valve in a home I just purchased. No problem installing the new pipe to the new valve which had male PEX-type connections. However, I could not force the new PEX pipe over the male ends of the old copper fittings and ball valve, particularly when I first put the copper crimp rings near the ends of the new pipe. What has changed and what is the work-around?
Are you thinking the gray plastic pipe is old pex. It is not pex and the fittings do not fit each other, There is an adapter fitting for between the two pipes, I think with a valve, you will need to change it and adapt the pipe on the other side of the valve,
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Old 11-14-2017, 03:32 PM   #3
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Re: New PEX pipe over old brass PEX fittings


Thank you for the helpful information. Please tell me what the old gray plastic pipe is called so I can purchase the correct adapter fittings the next time I need a repair/replacement. I do see that a previous owner used white Sharkbite PEX pipe in some locations. Also, there is red and blue plastic pipe attached to the new tankless water heater he had installed.
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Old 11-14-2017, 03:45 PM   #4
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Re: New PEX pipe over old brass PEX fittings


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Originally Posted by pbgvdad View Post
Thank you for the helpful information. Please tell me what the old gray plastic pipe is called so I can purchase the correct adapter fittings the next time I need a repair/replacement. I do see that a previous owner used white Sharkbite PEX pipe in some locations. Also, there is red and blue plastic pipe attached to the new tankless water heater he had installed.
adaptor from pex to polybutylene

They will be in the same display area as pex, you see the difference and it takes a different ring.
https://www.homedepot.ca/en/home/p.1...000102629.html
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Old 11-14-2017, 03:50 PM   #5
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Re: New PEX pipe over old brass PEX fittings


Note the polybutylene barbs are close together and the ring is brass colored, while the PEX part has the rings further apart and a black andonized ring. There may be variations by manufacturer, but there is a difference.
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