Kitchen overflow valve leak?

[tinpanalley]

Never had this problem before... Judging by its condition, looks like decades of tenants have just given up on the problem or more typically never noticed it. My wife and I always seem to be the ones who end up replacing or repairing things in apartments.

The white part that looks shiny is leaking very slightly at the side. Is there a simple way to fix it? Is that a known replaceable rubber/silicone part? I've tried tightening the screw on the inside of the sink, that doesn't seem to be working.

 

[Wayners]

Just replace waste overflow.
If it's a struggle just remove sink.
I could never get in without difficulty.
People don't aggre but I used to just take sink out and sort out.
Unscrew waste.
Remove tap tales
Remove sink clips

Lift out and repair sink

 

[steven lee]

That shiny white part is just the overflow cover, and behind it there is a foam or rubber washer that the screw pulls up tight. If tightening the screw does nothing the washer is perished, or the plastic underneath has a hairline crack. You can sometimes find just the washer, but a whole new overflow is cheap and usually quicker. Little smear of silicone on the new washer before it goes on never hurts.