A dripping tap can be due to anything from a damaged or perished rubber washer to a faulty spindle which can be quite easily replaced or repaired. Very often it can be caused by a leak path created in the brass of the internal washer seating and if you don't have the right kit it is a case of a full tap replacement. The Rothenberger Tap Reseating Tool is very easy to use and will restore the brass washer seating to a smooth surface again.