According to a conventional technique for reproducing a frame of a small image change amount at a high speed and a frame of a large image change amount at a low speed, there are cases in which a proper high-speed reproduction representing the outline of the moving picture image data is not necessarily carried out. The deflector blocks spray from the sprinkler in a given direction, while the attachment arms provide a readily deployable connector around the riser of an existing sprinkler. In a preferred arrangement, the devitrification barrier coating is formed from silicon nitride, which can be deposited on the vitreous component using chemical vapor deposition. The coupler fitting has a threaded first end configured to mate with the head shell and a threaded second end configured to mate with threaded first end of the coupler member. In a variant, the housing has a light receiving portion defining the chamber and a passageway to the chamber.