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Purchased new, I ended up with two so never used this one. It’s perfect and the box seals are still intact.

This glass ink bottle is the perfect accessory for any fountain pen user. The bottle can be used with any fountain pen that uses bottled ink, but its unique two-part anodized aluminum cap provides a special filling method for TWSBI Classic, Diamond, Diamond Mini, Kai, and Precision fountain pens.

Removing the upper cap reveals a filling port that plugs directly into the barrel of your TWSBI fountain pen, allowing you to draw ink up from the bottom of the bottle without any mess or risk of spilling.

If you don’t have one of the above mentioned pens the lower cap can be removed, and the upper cap can be screwed directly onto the bottle. A removable plastic reservoir makes it easy to draw ink from the bottle even when the ink level is low. Simply flip the bottle upside-down and back to fill the reservoir.