Abstract: A quick response frangible bulb sprinkler head includes a tubular body connected to a water line. The body has an outlet that is enclosed by a cap or closure, which is held in the closed position by a lever assembly. The lever assembly includes a pair of lever arms which are disposed in an X-configuration, with one end of each arm engaged with the body and the opposite ends of the lever arms are spaced apart and engaged with the opposite ends of an elongated glass bulb. The axis of the bulb is disposed normal to the axis of the outlet in the body. A screw is threaded in the closure and the tip is engaged with a channel-shaped pressure member that is connected to the central portions of the lever arms. Through adjustment of the screw, the compressive force on the bulb can be varied.