This is the Ink line or Tubing that is in the WIMS circulation unit. The DTG WIMS Circulation pump is on the DTG VIPER, DTG HM1-C, DTG Summit and more. There are many reasons why you would want to buy a new ink line for your WIMS Unit. The White Ink Management System (WIMS) can break down the tubing inside the circulation unit from constant operation, maybe you have purchased a used DTG printer only to find dried ink in the whole system. Either way, Changing out the ink line or tube in your circulation filter is easy and affordable. Watch our video on replacing this DTG Part.