4mm or 6mm Through Fitting for 4mm or 6mm tubing
TPC4-M6, TPC4-01 is for 4mm outer diameter ptfe tube and TPC6-01 is for 6mm diameter PTFE tube to get through.
M6 is thread size, 01 stands for 1/8 inch threaded screw
It is manufactured from a standard PC4-M6, PC4-01, PC6-01 pneumatic fitting. It's widely used in Bowden Step Extruder of 3D Printer.
The PTFE Tubing get through to the thermal tube till to the heater block, etc.