Abstract: A supply system for supplying a liquid reagent from a storage tank to a dispensing head, for example a foam molding head, includes a tank (12) having a lid (14) moveable between a closed position and an open position affording access to the interior of the tank and the underside of the lid, a pump (26) and a distribution valve (36) disposed on the underside of the lid, and a drive motor (27) for the pump and an actuator (37) for the valve on the exterior of the lid. Any leakage occuring in use from the pump and/or the valve takes place in the tank and leaked material remains inside the tank.