Printing: ptfe head double-sided printing, can be used for fixing, anti-corrosion, and rust prevention. Spare parts: if you have any questions about the product, please uspromptly, and we will provide you with satisfactory service. Easy installation: and disassemble, tools required, the ptfe connector to the cloned . Bowden connector ptfe head pneumatic head for cloned extruder upgraded bowden extruder 1.75mm Explanation: good , and easy to use. First, press in the metal body components, and then gently press in theblue . Suitable for bmgextruder