A liquid diffuser device includes a frame provided with a nozzle for generating a liquid jet; a deflector assembly having a deflector plate with an upper face facing the nozzle and a lower face with a shank extending therefrom; and a containment member associated with the frame and having a peripheral annular collar, a stem, and a rotatable support on a bottom wall of a cavity. The shank of the deflector assembly rests against the rotatable support, the deflector plate being spaced from the annular collar to enable the free rotation of the deflector assembly. A protection member joined to the deflector plate is configured to occlude the space between the lower face of the plate and the annular collar of the containment member and to enclose the containment member, the rotatable support and all moving parts of the deflector assembly, preventing the entry of liquids, solids and debris.

A sprinkler includes a body defining (a) a passage having an inlet configured to be fluidly coupled to a source of fire suppressant fluid, (b) an outlet fluidly coupled to the passage, and (c) a compression pin aperture extending from an outer surface of the body to the passage and configured to receive a compression pin, a button received within the passage, and a seal engaging the button and the body to fluidly seal the inlet from the outlet. The compression pin aperture is positioned such that the compression pin engages the button to force the button against the seal when the compression pin is inserted into the compression pin aperture.

A sprinkler module is cooperable with a sprinkler nozzle unit supporting a sprinkler nozzle to define a sprinkler configuration. The sprinkler module includes a cage attachable to the sprinkler nozzle unit and including a pair of struts, a cap connected to the cage via the pair of struts, and a deflector plate cooperable with the sprinkler nozzle and rotatably secured between the cap and the cage. The deflector plate includes a hub extending through the cap. A plate gear with gear teeth is secured to the hub and is rotatable with the deflector plate, and a cover assembly is connected to the cap. The cover assembly includes a brake gear coupled with a brake assembly, where the brake gear is disposed in a path of the gear teeth.