used today this adapter to press the waterpump (the metal outer one) seal safely in:
http://cgi.ebay.de/Messing-Schlauchtuel ... 0092983401
(don't know the english name for this adapter
)You need one in the size 1,25"x1.50", not in the size from the link. It fits nicely onto the seal and pressing it in is a piece of cake.
Charles