The PC4-01 Pneumatic Push in Bowden Extruder for 4mm J-Head fitting is a small part that connects the PTFE tubing to 1.75mm Filament extruder assemblies on 3D Printers. It is compatible with the standard up to 3mm ID PTFE Tubing, with a thread that universally fits M10 extruder fittings.This PC4-01 ..