This filler can with cartridges or (and I have before) operate with ink from the barrel. Had my last filler to a rotating wheel at the end of the filler, here I first had to look at how you filled the filler. Here a "special cartridge" is pushed, the adduced a small rotary member at the end. The flask is then scaled down, rotated held in the ink and then opposite to the filler, so that the piston draws the ink into the cartridge. Works, but the method using the wheel on the outside filler I find better, especially since the filler is a bit short by this way one can easily dirty finger obsolete during filling when the keg is something deeper. Nevertheless, the filler writes excellent. Here you can take for the money nothing wrong.