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C_J_GO 10-16-2009 06:39 PM

New Compression Shut Off Valve for Toilet Leaking
I am installing a new toilet in a new bathroom and I bought a compression type fitting/valve to install on the copper stub out of my wall. I have now installed 2 valve, both of which leak from the valve. Water is coming out of the compression nut on the wall side of the valve. I assume the compression ferrel is not tight enough. I have turned it per the directions, but do not want to go too much more in fear of overtightening it. One question is that I thread taped the threads on the valve; would that cause the compression nut not to compress the ferrel as it should? I do not want to try anything more until I hear back on some advice.


C_J_GO 10-16-2009 06:41 PM

A little more info...
My first valve I installed leaked and I kept tightening the nut down, eventually tightening it too much as when I removed the valve, the ferrel was indented into the copper pipe. Thus I have not tightened the second as much. I cut off the back section of copper pipe before installing the second valve, but I do not have much more I can cut off. Suggestions?

rselectric1 10-16-2009 06:45 PM

Until the plumbers can get to your question for a more definite answer, it has always been my understanding that putting teflon tape on a compression fitting can actually cause it to leak.

I have found that sometimes you have to give it pretty good torque to get them on correctly, but let's see what the pro's say.

Plumber101 10-16-2009 06:54 PM

Tape is not required for compression fittings

Clean off the tape and try again

JDC 10-17-2009 06:57 AM

Agreed. Get rid of the tape. When I have a stubborn one I'll put a light coating of pipe dope on the ferrule, but even that isnt required. The ferrule makes the seal, not the threads.

SULTINI 10-18-2009 08:15 AM

Same as everybody else remove all tape. Sometimes I put a little veg oil on my finger and run it around the copper and ferrule then tighten it, watch out you don't over tighten a common mistake, tighter is not always better in this circumstance.
Make it snug turn water on slow watch for leaks tighten little more if leak present.

C_J_GO 10-22-2009 03:30 PM

Yep, got rid of the tape and it has been dry for 2 days now. Thanks for all the help.

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