When I say "alacrity" I mean "alacrity". The commercial "unit" has been removed, and inlet and outlet pipes set in place with Rapid Araldite. The pipes to these have also been set in place, and have been fixed to the coil with cryo. The logic of being able to see the cooling water coming out is unquestionable, as is the fixing of the tubing. Thanks for the advice, and for the speed at which it was forthcoming. Joining this Forum has proved its worth !!!