In plants that use mixing nozzles there is opportunity to leave a mixer on the press when changing to a job that does not require it. The increased pressure drop through a mixing nozzle can be very large; for example, see Figure 28.2 for actual data comparing a general-purpose nozzle, a mixing nozzle, and a mixing tip. The transfer pressure jumped up when moving to a mixing nozzle and mixing tip and the end of fill cavity pressure dropped significantly.