It is a tool for print head cleaning and repairing. It helps to solve the poor printing problems, such as vertical banding, horizontal banding, or blank pages. Easy to operate, the steps are shown in Figure 3.After a long-term use of the print head, the air will enter inside to the print head, which will result in the lack of ink inside the print head, leading to the poor printing problems such as stripes or blank pages. This tool can help to pump the air out of the print head, and let the print head be filled with ink, so that the print head can print well.If the quality of the compatible ink is not good, such as ink with impurities inside, it will block the print head. When this tool is used to pump out the air, it will produce pressure to the nozzle, which will help to pump out the tiny impurities, so as to solve the problem of the nozzle clogging problem.Note: This tool package does not contain ink. You need to purchase it from other shops.For HP Printer head models:HP80/81/83/90/705. For HP printer models:Designjet 1050/c plus 1050cm 1055cm 1055cm plus 4000/ps 4020/ps 4500/mfp 4520/ps/hd 5000/ps 5100 5500/ps It is a tool for print head cleaning and repairing. It helps to solve the poor printing problems, such as vertical banding, horizontal banding, or blank pages. Easy to operate, the steps are shown in Figure 3.After a long-term use of the print head, the air will enter inside to the print head, which