According to the present invention, it is possible to connect the water flow valve and the pressure reducing valve to the water pipe without specially preparing a space for attaching it, and does not require any plumbing work for the connection, and the water field is connected to the water pipe. Thus, the water pipes can be connected.;An inlet coupling 10 is provided at one end of the body 1, an outlet coupling 11 is provided at the other end of the body 1, and a still water valve mechanism 17 is provided inside the body 1. In the still water front (V) provided with the steering wheel 19 for operation on the outer surface side of the body 1, the constant flow rate valve z is provided downstream of the still water valve mechanism 17 inside the body 1, It is assembled so that the water flow flowing into the body 1 of the inlet coupling 10 flows to the side of the outlet coupling 11 via the constant flow valve z.
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