How can I repair a leak in a sink valve stem?

spark_sara

I’ve dealt with leaking under the sink before (in the kitchen). The issue now is the bedroom bathroom sink. I have two sinks and I’ve been only using one and not the other, so turned the unused sink’s stop valve to off . In preparation for family’s visit, I turned on the stop valve of the other aink. And I notice there was leaking. . Took a picture of my bathroom sink#2 underbelly. From my kitchen sink experience the nut (#4) closest to the stop...

Originally asked by punsoca on Stack Exchange (diy) (CC BY-SA 4.0).

uphilltech

Great question — answering as the UphillTech team:

At close look, you have heavy corrosion on the stem of the valve (#4). This happened on older version of valves. Now days they use plastic stem that does not corrodes. You can try cleaning it, first with vinegar to get the caclk, the spray and wait with WD 40. Eventually you should replace that valve with newer version and plastic stem. As for wrenching around always hold the #3 firm in place.

Full answer by DIY75: https://diy.stackexchange.com/a/269718 (CC BY-SA 4.0).

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