To prevent the generation of warm and mold caused by the water pooled on a bottom part even when the water is leaked from a sprinkler valve to some extent by mounting a covering body on an upper opening of a bottomed housing in such manner that it can be opened and closed, and forming a sprinkler valve mount part and a draining port on the bottom part of the housing.

A covering body 2 made of cast iron or plastic is mounted on an upper opening part of a plastic bottomed housing 1 in such manner that it can be opened and closed. A bottom part 1c of the housing 1 is a raised bottom, and a rear part of the bottom part 1c is used as a piping space, so that a feed water pipe to a sprinkler valve 3 can be easily connected. A sprinkler valve mount port and a draining port 1e are formed on the bottom part 1c of the housing 1, and the cylindrical draining port 1e is projected from the deepest part of a recessed part 1f formed on the bottom part 1c, and a short pipe for drainage 5 is inserted and connected to the draining port 1e from a lower part. Whereby the water leaked from the sprinkler valve flows on an inclined bottom surface of the recessed part 1f to flow to the draining 1e.