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:HP10/11/12/13/82/84/85. For HP printer models:Officejet Pro K850/dtn. Color inkjet CP1700/D/PS. Officejet 9100/9110/9120/9130. Designjet 10ps 20ps 30/n 50ps 70 90r/gp 130/r/nr/gp 100/Plus 110/plus 120 111 500/ps 510 800/ps 815MFP 820MFP. Business inkjet 1000 1100d/dtn 1200/D 2200 2230 2250/DN 2280/TN 2300/d/dtn 2600/DN 2800/d/dtn 3000 3000n 3000dtn 2000c/cn/se/cxi 2500c/cn/cm/sce/cxi 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