Bosch nozzles are inward opening with a multiple orifice and hydraulically operated nozzle valve. The two models of this nozzle in use are the American Bosch and Robert Bosch. They may be easily identified by either the length of the nozzle tip holding nut or the nozzle drilling code on the smaller diameter of the nozzle valve body. The American Bosch nozzle nut is 3 inches long, and the nozzle tip has a hand-printed drilling code. The Robert Bosch nozzle nut is 2 inches long, and the nozzle tip has a machined-etched drilling code. Component parts, although similar, are not interchangeable between the two nozzles.