Background: When running water in my bathroom sink, I'm seeing a small water leak (about a drop per minute). I traced the source to the bottom of the pivot rod connector - see the red circle in the attached picture.

Questions: Given that the leak doesn't appear to come from where the connector itself is screwed in, what might the cause be? Can water still be reaching the pivot rod itself?

enter image description here


what might the cause be?

  • The connector isn't tight, so the pivot assembly is loose, so water can work past the seals.
  • It was assembled with dirt in the seals
  • A seal has failed or is damaged
  • Something else.

Can water still be reaching the pivot rod itself?


I would disassemble, clean and inspect. replace any worn or damaged parts - especially rubber/plastic seals around or in the pivot assembly. Reassemble and test.

Example from Grohe:

enter image description here

8.4 45265 Nut and bushings
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  • 2
    With those plastic rod nuts it is also common to see a hairline crack on the nut, barely visible, due to over tightening. – Jimmy Fix-it Jun 29 '16 at 5:13
  • Also, I hope what I think I see is not indeed what I think; clear silicone caulk between the sink and the drain assembly nut. Nooooo.... – Jimmy Fix-it Jun 29 '16 at 5:16
  • @RedGrittyBrick - what's the appropriate seal for this connector? Plumbers tape or something else? – Craig Jun 29 '16 at 14:56
  • 2
    @craig, there's two special tapered washers, one on each side of the pivot ball. You can buy replacement sets. You shouldn't normally need any tape or other sealant. Tighten until snug, take care not to over-tighten. – RedGrittyBrick Jun 29 '16 at 16:39
  • 1
    Turned out the issue was a cracked washer inside the pivot rod connector. – Craig Jul 4 '16 at 17:59

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