A safety mechanism for a trigger activated dispenser which dispenses a pressurized fluid includes an engaging piece connected to an upper surface of a dispenser body by a hinge. The engaging piece, the dispenser body and the hinge are molded integrally from a plastic material and an engaging groove is formed on an upper surface of a nozzle cap to receive the engaging piece when the nozzle cap is rotated to an "Off" position. When the engaging piece is received in the engaging groove in the nozzle cap, the nozzle cap is locked in the "Off" state and the nozzle cap is prevented from being rotated to any position at which liquid can flow.