Molotow is the worlds leading name in Acrylic markers. 'One4All' premium quality pump marker pens are the only refillable acrylic marker on the market and feature their patented capillary and valve system – making them a truly unique and remarkable product. This Refill Extension is a smart little refill helper for use with all 400 and 600 Series Molotow Pump Action Markers. To be assembled between the pump valve and paint tank it allows for easy, fast and clean refilling, preventing dirty fingers.