How To Diagnose Leaking & Dripping Taps

Leaking from the tap:
If you find water leaking from the top of the tap it could be one of two problems:

  1. The gland nut which keeps the spindle in place may need tightening.
  2. The O-ring (the rubber seal that sits on the spindle) needs replacing.
Leaks from below:
Swivel spouts in particular are prone to leaks at the base. This can be quickly fixed by removing the spout and replacing the seal.

If you find water leaking from the underside of the taps it's best not to try and fix it yourself.

Article source: http://www.homeserve.com/videos/plumbing-drains/diagnose-leaky-and-dripping-taps