To fill the brush pen, unscrew the tip of the pen, dip the barrel in water, and pull back on the piston. Then, reattach the brush tip to the pen body and turn the pen so that the brush tip is facing straight up. Once the water has settled at the bottom of the piston, slowly push the piston back into the pen. A small amount of water may leak from the brush tip as you do so.
- Brush-shaped solid felt tip.
- Piston pump mechanism for reliable, consistent filling.
- Rigid plastic body to help prevent accidental squeezing.
- Rubber squeeze buttons for pushing additional water into the tip.