Thanks, is the collection pipe part available separately?it has an internal pipe to collect from the depression in the base of the tank
I couldn't see anything on Mini Spares diagrams.
I should remember all this but i refurbished the tank more than 5 years back.
photo (upside down!) of the internal arrangement - note that there is a gauze filter on the end of the collector pipe
did you use any kind of tank sealer when you refrubed the tank ?