PURPOSE: To secure the long service life and proper water sprinkling conditions by reducing the heat development caused by the rotating friction of a rotating block of complete-round type composed of synthetic resin.

CONSTITUTION: A synthetic resin nozzle main body 2 consists of a body section 2a and an arm 28, and a synthetic resin rotating block 3 with a water spray slit 12 is installed rotatably between a receiving hole 5 for the arm 2b and a mixing shaft 6 of the body section 2a, and a water spray nozzle 1 of complete- round type is constituted thereon. The mounting shaft 7 for the rotating block 3 is set into the hole 5, and heat dissipation hole 13 is continuously formed in the heating hole 5 for the purpose of reducing the heat development generated by the rotating friction. A water spray socket for mounting the water spray nozzle 1 consists of a small diameter section and a large diameter section, and the socket can be used for both of a vertical piping and a horizontal piping by the installation of an adjusting cock.