Is a compression fitting supposed to be able to rotate?

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Flapper

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Is it normal for a compression fitting to be able to rotate after being connected? I installed a stop valve with a compression fitting and it could rotate, even with the water on, but it doesn't leak.
 

CountryBumkin

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The ferrule (ring) should not turn on the pipe if it is tightened fully, but without knowing the design of the fitting you used it is hard to say if something is wrong or not. Does the "compression nut" turn with the fitting - or is it just the outer part of the fitting that is turning?
 

Dj2

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It should be snug. If it's not, it will rotate, and may leak later, if not already.
Using your two wrenches, give it another quarter turn, see if it rotates now.
 

Reach4

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Compression fitting directly on PEX?
Or compression fitting on metal?
 

Jadnashua

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If your pipe is pex, you can still use a compression valve, but it MUST include the internal reinforcement ferrule, otherwise, you'll never be able to chinch it up properly as the material will continue to collapse as you tighten. In fact, it's the same valve as used on copper, but either comes packaged with the appropriate ferrule, or you can buy them in bulk and use them as needed, depending on the pipe you find.
 

Smooky

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The ferrule is circular ring on the outside of the pipe. The part that stiffens the plastic pipe is the brass insert.

https://www.zoro.com/value-brand-in...gclid=CP_G37m4l84CFdgJgQodlj8AEw&gclsrc=aw.ds
Brass Insert.png
 

Reach4

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Many have observed compression fittings on PEX being able to rotate. Plumbers would usually use a copper stub if using PEX and mount the stop valve to that.
 

CountryBumkin

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Wirsbro AquaPex will work with a Ferrell and Insert. But if you have the choice in the future, use the ProPEX fittings (that's the brilliance of the system). IMO.
ProPex stop valve.jpg
 
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