Shower accessory for addition of shower gel etc.

摘要

The device has a piston pump (14) to suck a portion of the additive from a store (16) into a pump chamber and to add this portion to the flowing mains water. The flowing water operates the pump via working pipes (10,17) to supply the additive, and via a control unit (11,12). A pump plunger (13) blocks a main water valve (6) towards the end of the pump addition stroke. The piston has a double piston, with a larger piston surface facing the working pressure and a smaller surface facing the additive in the pump chamber.