Overview
The PC4-M6 Pneumatic Fitting is an essential replacement component for standard 3D printer Bowden-style extruders. It provides a reliable, high-grip connection for 4mm Outside Diameter (OD) PTFE tubing using an efficient push-to-connect mechanism. Equipped with a 6mm (M6) male thread, this coupler is specifically designed to screw into aluminum MK8 extruder blocks, plastic feeder assemblies, and some low-profile hotends.
When your 3D printer executes heavy filament retractions, a worn-out coupler can allow the Bowden tube to slide back and forth. Replacing it with this heavy-duty brass fitting ensures a rigid filament path, eliminating under-extrusion and improving overall print quality.
Key Features
Instant Push-In Connection: Slide your 4mm PTFE tube straight in for an automatic, secure lock.
One-Touch Release: Press down on the plastic collet (release ring) to pull the tube out effortlessly for maintenance.
M6 Metric Threads: Standard 6mm thread diameter, perfectly matching MK8 extruders and stock Creality feeder frames.
Heavy-Duty Construction: Built with a durable brass body and internal stainless steel lock claws that prevent tube slippage under pressure.
Technical Specifications
| Feature | Specification |
| Model | PC4-M6 |
| Supported Tube Outer Diameter (OD) | 4.0 mm |
| Thread Type | M6 (Metric 6mm Male Thread) |
| Material | Brass Body + Stainless Steel Teeth + Plastic Collet |
| Filament Compatibility | 1.75mm Filament Setup (via 4mm OD Tube) |
| Commonly Used For | Extruder Feeder Side (Input/Output) |
How to tell PC4-M6 and PC4-M10 apart?
PC4-M6 (This product): Has a smaller, thinner 6mm thread. Used primarily on the Extruder Motor end.
PC4-M10: Has a much wider, thicker 10mm thread. Used primarily on the Hotend/Heatsink end.
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