The Pineider Pen Filler is a traveling ink bottle. Fill any pen anywhere. Pens from 9.5mm to 13.5mm across will fit up into the ink chamber.
Simply fill the filler with your choice of ink. To fill the pen:
1.    Insert pen nib-first.
2.    Lock the pen in place by turning the top of the filler.
3.    Flip upside down.
4.    Fill pen! You're done!