Abstract: A sprinkler has a frame and a cap closing a fluid discharge orifice at one end of the frame. A lever member is pivoted at one end portion on a compression screw which extends from a frame portion generally opposite the cap. The lever member curves from its one end portion to a portion generally parallel to a strut member which extends from the cap to the pivoted end portion of the lever. A pair of arms extend from one member and straddle the other. One arm has a socket for receiving a ball on one end of a tubular retainer and the other arm has a boss engaging a dimple on the other end of the retainer. A side of the retainer engages the arm-straddled member to hold the members in place until heat as from a fire melts a fusible element in the retainer to permit the ball to retract into the retainer. The retainer then pivots about the boss to release the strut from the cap for discharging fluid from the orifice.