seal is worn out (or gone)in the plastic ring that the top rack nozzle joins with when rack is pushed home. You can buy a new one but if the wheel arms of the rack are a bit bent it will wreck it again very quickly. You could try an alternative: instead of closing the hole with a seal, build up the nozzle around the base with a hot melt glue gun until it is snug.
lol, October 2007