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Ten small brass push-fit connectors with blue plastic collars and M6 threads

KEHIPI

KEHIPI PC4-M6 Pneumatic Fitting 10pcs 3D Printer Accessory

SKU CH-A9KP-Z6JN8

Pack of ten push-to-connect fittings with PTFE tubing for 1.75 mm filament Bowden extruders

  • Color10*PC4-M6
  • Durable stainless-steel construction resists oxidation and rust
  • PC4-M6 thread M6 fits 4 mm OD Bowden tubing
  • Quick push-to-connect design speeds extruder assembly
  • Includes 1.5 m PTFE tube with 2.0 mm ID and 4.0 mm OD
  • Compatible with 1.75 mm PLA and ABS printers

10-piece pneumatic kit for 1.75 mm printers

This kit supplies four PC4-M6 and four PC4-M10 push-to-connect fittings plus two 1.5 m lengths of PTFE tubing. It is aimed at owners of 1.75 mm PLA or ABS machines who need to replace worn Bowden couplers or rebuild a filament path. The mixed thread sizes cover the two most common extruder and hot-end ports found on popular desktop printers.

Brass and stainless bodies with low insertion force

PC4-M6 fittings use a copper-alloy body and the PC4-M10 versions use stainless steel, both paired with a polymer collet. The 4 mm tube bore matches the 4.0 mm OD tubing supplied, so the filament slides without binding. No tools are required beyond finger pressure to seat the tube, and the cutter included lets you trim the 2.0 mm ID liner to length cleanly.

Secure seal during long prints

The collet teeth grip the PTFE tube evenly around its circumference, preventing the tube from backing out when the extruder retracts repeatedly. Stainless threads on the M10 side resist heat creep from the hot end, while the brass M6 side handles cooler extruder mounts. Both materials hold their dimensions over hundreds of heating cycles without the need for re-tightening.

Highlights

  • Durable stainless-steel construction resists oxidation and rust
  • PC4-M6 thread M6 fits 4 mm OD Bowden tubing
  • Quick push-to-connect design speeds extruder assembly
  • Includes 1.5 m PTFE tube with 2.0 mm ID and 4.0 mm OD
  • Compatible with 1.75 mm PLA and ABS printers

Specifications

BrandAITRIP
Model15398
Color10*PC4-M6

Questions about this item

How do I install the PC4-M6 fittings on a Bowden extruder and what step is often missed?

Screw the M6 thread into the extruder until the copper body seats, then push the 4 mm OD PTFE tube fully into the blue collet until it hits the internal stop; the step often missed is pulling back gently to lock the collet teeth.

Which parts will need replacement first and how often?

The PTFE tube (2.0 mm ID, 4.0 mm OD) degrades from heat and friction; plan to replace the 1.5 m lengths every few hundred print hours, while the stainless-steel PC4-M10 and copper PC4-M6 fittings typically last the printer's life.

What limit appears first during long prints with 1.75 mm filament?

The 2.0 mm inner diameter of the PTFE tube creates the primary flow restriction; sustained high-speed extrusion will hit pressure limits at the tube before the 4 mm fitting bore becomes a factor.

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