What fills your pen up with ink?

refill.....

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Biro type pen come with an interchangeable refill which can be purchased in most stationary stores. However, this applies to the more expensive ball point type - the more inexpensive version are just throw away (recyclable).

The ink fountain pens have two options; a small ink filled cartridge which is swapped as each runs out and the pump action type where you remove the upper case and there is a rubber tube inside which is squeezed when then nib is in the ink pot and the ink is sucked up filling the tube.