To facilitate water stopping operations compactly.

This air valve is so constituted that a communication hole 3 communicated with a repair valve 1 is formed at the lower part of a valve box 2 connected with a pipe line through the repair valve 1, concurrently, a large air hole 4 is formed at the upper part of the valve box 2, and a floating valve body 5 for opening/closing the large air hole 4, and a floating valve body 7 are provided in the valve box 2 in such a way that they can be moved up and down. In this case, the repair valve 1 is provided with a circular plate shaped valve body 10 capable of being rotated in the horizontal direction for opening/closing the communication hole 3, the pivot 12a of a pinion 12 is extended upward, which is meshed with a rack 11 formed at one side periphery of the plate shaped valve body 10, and an angular shaft part 13 to be engaged with the angular hole part of an operating tool 20, is formed at the upper part of the pivot 12a.