body, and aligns the deflector with the path of the water when it is discharged through the outlet opening. The outlet opening is normally closed by a closure seal which is held in place typically by a trigger element, such as a glass bulb or a fusible link element. The trigger element extends between the seal and the frame and is usually held in place by a set screw or the like.
Other forms of sprinkler assemblies include flush sprinkler assemblies. Flush sprinkler assemblies include a housing and a deflector which is recessed within the housing. The deflector is movably mounted to the sprinkler body by a pair of guide members and moves between a closed position in which the deflector is recessed within the housing and an extendedposition wherein the deflector projects from the housing and is spaced from the outlet opening of the sprinkler body. Since the deflector is supported only by two guide members, the deflector can experience instability or rotation about the axis extending between the two guide members. Similar to a fixed sprinkler assembly, a flush sprinkler assembly includes a thermally responsive trigger mechanism and a fluid seal. In a flush sprinkler, the fluid seal is positioned within the interior of the sprinkler body and is maintained in a closed position by a pair of pins or actuators. The pins are inwardly biased by the trigger mechanism. Thus, under normal operating conditions, the trigger mechanism prohibits fluid flow from the outlet of sprinkler body. When the temperature rises to a preselected