WATER SUPPLY SYSTEM

PROBLEM TO BE SOLVED: To provide a safety water supply system in which a water-related equipment is connected simply without requiring skill and each countermeasure to the danger of the blow-off of water by a human mistake in the case of connecting works and the danger of contamination by a back flow by the mistake of the selection of instruments in emergency and a cutoff valve return after the interruption of a leakage of water are facilitated to both dangers. SOLUTION: In the water supply system in which water-supply hot-water supply utilizing terminal equipments such as a faucet metal fitting, a washing machine or the like are arranged at a terminal and water is supplied and hot water is supplied, a check valve 2 is installed to the upstream of a hydrant with an on-off valve 3. A path is contacted and supported to a joint opposite material forwarded and retracted and connected on a water-conveyance path axis and opened in the downstream of the on-off valve 3, and a cut off valve 4 cutting off water in the case of the removal or slipping-off of a joint is fitted.