Leaking kitchen sink water supply line - help!


Old 01-11-08, 02:27 PM
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Leaking kitchen sink water supply line - help!

We have just replaced the kitchen sink during a total kitchen renovation and are having trouble stopping a leak from the hot water supply line. We removed the old sink about one month ago, and at that time turned off the supply line valves under the kitchen sink. There have been no leaks during the last month leading up to our sink and faucet install. Now we have connected the new sink, and the drain lines seem fine. But, after connecting the supply lines to the faucet and opening the valves, the water supply line leaks above the valve. We have tried diconnecting and reconnecting it a couple of times, but the leak won't go away. Also, it is no longer possible to completely turn off the valve when disconnecting the line to the faucet. There is a steady drip after closing the valve. What might we be doing wrong? Thanks for your help!
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Old 01-11-08, 02:57 PM
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Do you know exactly where it is leaking? Is it leaking from the 3/8' supply compression nut, for sure?

If so, what is the 3/8 inch supply line made of and what is the compression ring washer (ferrule) made of? Pex tubng requires the plastic ferrule. The chrome coated brass ones require the brass ferrule.

Also, if the chrome 3/8 " compression nut is foreign made these are thinner walled, noticeably lighter, more prone to get a hairline crack in them from overtightening. Then all the tightening in the world will not stop the leak, and actually it will worsen! I know from experience and discussing with master plumber.

The shut-off stop leaks now, itself? Washer maybe partially tore/squirted off from over tightening. Most of these stops do not hold the washer in place with a screw. The washer simply is forced over a raised nipple and is held only by it.

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