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CallMeVilla 06-04-2014 07:12 PM

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Let's try to be systematic. The drips usually show up on the underside of a supply line or the drain piping. The water, obviously, came from up above somewhere. You need to wedge yourself under the sink with a flashlight while the water is running. Look carefully at the connection point under the faucet. Wipe the area with a rag then look for water accumulation.

You should be able to isolate the source area.

If it is the faucet, you might need to put a bead of plumber's putty under the beauty plate which sits across the top of the sink up above. You will need a basin wrench to tighten the nuts ... This could be difficult which explains why faucets are mounted to the sinks BEFORE the sink is dropped in the counter top.

Single handle (cartridge) faucets feed their hot and cold upward and the connections are made 1/2 way, transitioning from the flexible supply lines to the more rigid copper lines which got up and into the faucet. Those connections can be leaking too. You will need Teflon tape and two wrenches to make these connections water tight.

Sometimes, it is the supply line to the hand wand. This is rare but you should look closely anyway. The connection is the same as the hot/cold.

Plumbing is not magical but it does require focus and tenacity. Remember: You are smarter than the pipe!

CallMeVilla 06-04-2014 09:54 PM

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AH, my bad. Thanks Neal ... This means two cartridges or valves which can leak and the mixing crossover which feeds the faucet head.

Nonetheless, the supply lines will connect to the individual valves and if a leak is coming from there, it would be readily visible. Dry the highest spot with the water running into the valve. Wait, observe, shout "GOT YOU!" if it is leaking. If not, move to the next connection, repeat process.

If the o-ring of the faucet is leaking, then the "drop point" should be near the center of the unit ... Causing another shout out ...

This is all about systematic observation with a strong flashlight and some padding under your back. Sucks to be under the sink, but somebody has to do it!

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