For Olympic swimmers like Paul Palmer and Nick Gillingham, the Aquapacer training aid plays a vital part in their preparations for international competition.

Playing an equally vital part is the seal we developed for the sounding unit - a D-section rubber component seated in a grooved dome that not only proved absolutely watertight, but also allowed the lid to be snapped shut easily and positively.

The manufacturers, Challenge & Response Ltd, had experienced numerous problems with their previous suppliers, but once again we came up with a solution that's obviously a breast-stroke of genius.