I changed all the angle stops in the house. The only one that gave me a problem was the kitchen sink hot water dual outflow (dishwasher). It just weeped the tiniest bit from behind the compression nut. I took it all apart and cut the pipe again for a clean cut, cleaned it up, put on a new compression ring and got the same result. Very annoying. I have read all the suggestions regarding grease and o-rings and teflon tape. Are there any other suggestions so that the new valve works like all the others?

When a compession nut leaks we just get 2 wrenches and tighten another 1/4 turn

Bob nailed down good, also see the images below it may help, Thanks.

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Originally Posted by ballengerb1

When a compession nut leaks we just get 2 wrenches and tighten another 1/4 turn

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Thanks. I tried that the first time around and the second time. I'm a little scared to keep cranking down on that nut. I figure I either have a bad valve or the pipe is distorted just enough to make it barely weep. Next step is to take the valve back and exchange it for another. After that, I guess I am down to cutting the pipe back one more time to see if I can get beyond and distortion that might be present.

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Originally Posted by afaroo

Bob nailed down good, also see the images below it may help, Thanks.

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What is the function of the packing nut (#2 in the photo)? If that is not tight, could it cause a leak behind the compression nut?

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what is the function of the packing nut (#2 in the photo)? If that is not tight, could it cause a leak behind the compression nut?

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The packing nut prevents leakage from around the stem. You don't tighten it like a compression nut, you snug it up until the drip stops and let it be.
The packing nut has no relationship with the comporession nut and does not affect it.
If any one advises putting pipe compound on the ferrule disregard it.
My company had a problem with the brass splitting ewhen out plumbers would coat the ferrules with pipe compound.
Are you sure the copper stubout isn't slightly out of round?
Regards, Tom

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Originally Posted by speedball1

The packing nut prevents leakage from around the stem. You don't tighten it like a compression nut, you snug it up until the drip stops and let it be.
The packing nut has no relationship with the comporession nut and does not affect it.
If any one advises putting pipe compound on the ferrule disregard it.
My company had a problem with the brass splitting ewhen out plumbers would coat the ferrules with pipe compound.
Are you sure the copper stubout isn't slightly outta round?
Regards, Tom

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No speedball1, I'm not sure the pipe is not slightly distorted. What I do know about the pipe is when I use the ferrule removal tool, the male end of the tool fits perfectly inside the pipe. At least I know the end of the pipe is round. Could be I cranked the compression nut so tight that the ferrule or the pipe distorted. Before I cut back further and further on the pipe, think I will try a new valve-