The TWSBI Vac 20A ink bottle in Green was designed for the TWSBI Vac 700 and the Vac Mini fountain pens, and allows for a complete full in one stroke. Simply fill the bottle with ink and replace the cap, screw the TWSBI Vac fountain pen into the top of the bottle, extend the vac plunger invert and push in the plunger to fill completely. The innovative design also works with any fountain pen by removing the upper cap.
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