Continuous inksystem,ciss for Epson T22/TX120/TX320/TX420 printers. Continuous ink system cartridge No.: T1331N black ink cartridge, T1332N cyan, T1333N magenta, T1334N yellow. Benefits: 1. No more Ink Cartridge purchase, No more Cartridge replacement. Refillable ink tank allow countless refill. 2. The easiest way to install Continuous Ink System. Anyone can do it within 5 minutes. 3. Tremendous savings with compatibles, and print up to four times as much for the same money. 4. All ink can be pre-filled. True system ready for "Plug & Play" 5. Use on any type of paper. 6. High page yield. 7. Doesn't require you "pump the ink" to get it work. 8. If you run out of the ink, you will only need to buy the refill ink for this system. simply pour the new ink to the tank. 9. Our high quality inks are identical to the originalEpson inks. 10. 100% satisfaction guarantee. Note: 1. After installing the CISS Systems, do not move the ink tank unless it is necessary. 2.When you are printing,do not move the ink tank up or down. Keep it stable and at the same level as the printer. 3. Store at 15-35 degrees Celsius. 4.The ink and cartridge flow have been designed and tested to function as a system. We recommend you use our specially designed ink in the CIS for optimal results. 5.If the color mixing problem happens,check if a single color ink volume in the tank is much higher than the other color,the color volume differece should be less than 0.5cm.