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Old 01-18-2018, 02:20 AM   #11
breplum
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I haven't worked with CPVC myself but there are a few things to note.
1. You do have compression valves, so all you need is a pair of new 5/8"x3/8" quarter turn compression angle stops.
2. Your corrosion may just be deposits, and you can clean off the existing compression nut with steel wool and add the valve body to the existing nut and compression ferrule.
3. On copper, we sometimes use a ferrule removal tool especially made to remove the nut and ferrule. I have never tried it on plastic...
4. Worst case; cut the pipe at the nut, use shallow/flat escutcheons and use the whole new angle stop.
NICE photo by the way.


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Old 01-19-2018, 01:03 AM   #12
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breplum,
Thanks for your help!

Yes, they are compression, thanks for that confirmation. The existing nuts are mega-corroded. Not sure how I feel about re-using them and the previously used ferrule. Seems like it might be risky. Interestingly, I talked with the plumbing company that plumbed my entire house when we built it 18 years ago, and he also confirmed that they used compression fittings on CPVC. He also suggested to use the old nut as you did.

At the moment, I am leaning toward just cutting the CPVC and going with a glued connection. I've had great luck with that. If I use a flat escutcheon, there will still be room for another cut and reinstall at some point in the future.

Since I am on well water, I am not convinced that SharkBite connectors are the best way to go. Once they get corroded, they may not be easy to remove either.


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Old 01-19-2018, 02:36 AM   #13
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I can't believe a "plumber" told you to reuse the existing nut and ferrule.
The nuts are not always a true fit to the new valve.
Most cases they might work, but I followed behind a handyman that did just that.
Had a compression nut, not just leak, but the entire valve blew off.

here is a YouTube video I recently found.
Relates to various fittings and how they hold when pipe is frozen.
Not the same topic but some interesting results that you can apply here.

https://youtu.be/OOeBJ8mDr8Q
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Old 01-19-2018, 05:15 AM   #14
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We have been involved with replacing angle stops on single and mulit-unit buildings piped with copper. So far, 200+ angle stops and 30 +years and haven't had any call-backs or issues (yes, many of my customers are regulars from our 40 years in business). In all of that, I don't think we have pulled more than 25 ferrules first. Just my experience.
A properly tightened compression angle stop will not blow off. That is downright poor trade-craft. (Frozen pipes not part of discussion).
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Old 01-19-2018, 02:01 PM   #15
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Quote:
Originally Posted by breplum View Post
We have been involved with replacing angle stops on single and mulit-unit buildings piped with copper. So far, 200+ angle stops and 30 +years and haven't had any call-backs or issues (yes, many of my customers are regulars from our 40 years in business). In all of that, I don't think we have pulled more than 25 ferrules first. Just my experience.
A properly tightened compression angle stop will not blow off. That is downright poor trade-craft. (Frozen pipes not part of discussion).
I would think that a company that charged $200 / hour would take the time to replace a nut & ferrule that was part of the new valve I was paying for.

200+ valves in 30 yrs? That's almost 7/yr. I 'll take that as a typo error.
Sorry for bustin' your chops, but leaving old nuts and ferrules is something a DIYer would do.

The video I linked was not so much about freezing water but on how well some fittings held when submitted to extreme pressure. Most interesting to me was the sharkbytes on plastic vs copper.

The stop valves I experienced blowing off had a slight mismatch in size between the old nut and new valve.

Do you know what an ameriflex stop valve is?
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Old 01-21-2018, 12:03 AM   #16
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Quote:
Originally Posted by Mr_David View Post
I would think that a company that charged $200 / hour would take the time to replace a nut & ferrule that was part of the new valve I was paying for.

200+ valves in 30 yrs? That's almost 7/yr. I 'll take that as a typo error.
Sorry for bustin' your chops, but leaving old nuts and ferrules is something a DIYer would do.

The video I linked was not so much about freezing water but on how well some fittings held when submitted to extreme pressure. Most interesting to me was the sharkbytes on plastic vs copper.

The stop valves I experienced blowing off had a slight mismatch in size between the old nut and new valve.

Do you know what an ameriflex stop valve is?
In order for Billy to replace the whole comp valve including the 5/8 nut and ferrule he will have to go into the wall and cut the 1/2 cpvc pipe and put a coupling in the wall and then extend the pipe out past the wall enough to put a new escusion on and then the new valve. Put a little pipe dope on the valve threads for a better seal. Give yourself some room and extend the pipe out a ways.


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