To dispense with the connection work of a stop valve to a water supply pipe on the installation site.

This water supply has a pipe body 3 with an opening 6 that communicates an inside and outside on a side circumference part, the valve casing 8 with the valve seat 10 stored in the part that the opening 6 of the pipe body 3 is formed, a movable ball valve body 12 stored in the valve casing 8 and a valve body operation member 20 that is set in the above opening 6. The above ball valve body 12 is to be a rotation free between "close position" and "open position" (with a horizontal axle center) on the axle center that crosses a axle center of the pipe body 3.