The present invention provides a water piping system wherein when a predetermined time elapses after the flow of the water in a hose has stopped, the water is drawn out of the hose, thereby preventing proliferation of various bacteria in the water standing stagnant in the hose and when the temperature...http://www.google.de/patents/US5287876?utm_source=gb-gplus-sharePatent US5287876 - Water piping system
