Spraymaster 55 Gallon System, Long Run 1/2HP - 140GPH. Drum, Pump and Timer system only. SprayMaster SM55 Automatic Spray System consists of a 1/2 horsepower electric motor-driven pump controlled by a solid state electronic timer that is programmed to dispense an insecticide formulation in the form of a very fine mist at specific intervals through special spray nozzles. The result is a state of the art, hassle-free solution to control of harmful flying and biting insects in and around horse barns and other livestock confinement buildings. Use SM55 for larger systems of 15-70 nozzles. Order Tubing, Nozzles, Insecticide and Nailers/ties/clips separately.