PURPOSE: To keep a spreading pipe from being deformed when high pressure is applied thereto and to simply connect a water distributing pipe to a sprinkler head.

CONSTITUTION: Plural short pipes (a), (b), (c) are connected to each other through ball-universal joints to form a spreading pipe 1, and one end 1a of the spreading pipe 1 is connected to a branch pipe 6 of a water distributing pipe 3 through a ball-universal joint 2. The other end 1b of the above spreading pipe 1 is connected to a lateral 7 of a sprinkler head 5 through a ball-universal joint 4.