To secure a water feed passage without any special working to a plug rod of a stop valve by providing a bypass flow passage leading to a second valve seat from a first valve seat so as to bypass a first screw part between the first and second valve seats.

A plug rod 14 supports a first valve element 13 of a stop valve part 6 to be seated on a first valve seat 12 in an advancing/retracting direction. A support lid 19 supports a second valve element 18 of a reverse flow preventive part 4 to be seated on a second valve seat 16 in an advancing/retracting direction. In addition, a water feed passage (a) leading to a water outlet 11 from a water inlet 10 is formed in a stop valve body 7. A stop valve part 6, a strainer 5 and a reverse flow preventive part 4 are successively arranged from an upstream side to a downstream side of the water feed passage (a). The water feed passage (a) can be secured by a simple mechanism where a bypass flow passage 12 is provided between the first and second valve seats 12, 16 without cutting a threaded part of the plug rod 14 to be screwed in first thread part 15, and the assembly property can be improved, and the cost can also be reduced.