PC4M6 Pneumatic Connector Key benefits Quick and secure connection: insert a 4 mm outer diameter Teflon (PTFE) tube and the connector automatically locks in place for a reliable feed. Easy release: press and hold the blue part to smoothly pull out the tube without damage. Durable construction: built from copper and plastic for sturdiness and long service life. Precise sizing: M6 thread with a 3 mm thread, inner diameter 4 mm (blue end), designed for 4 mm outer diameter PTFE tubes. Broad printer compatibility: strong compatibility with all 1.75 mm filament 3D printers. Specifications Model: PC4M6 pneumatic connector Material: copper and plastic Thread: M6 / 3 mm Inner diameter (blue end): 4 mm Tube compatibility: suitable for 4 mm outer diameter PTFE tube Function: automatic locking upon insertion; blue release mechanism for easy tube removal Compatibility: works with all 1.75 mm filament 3D printers Use scenarios Upgrading or maintaining a 1.75 mm filament 3D printer: quickly connect a 4 mm OD PTFE tube to the extruder system with a secure lock and easy release when needed. Quick tube changes during multimaterial printing or testing: fast connect/disconnect to switch tubes without tools. Laboratory or workshop prototyping: reliable 4 mm OD PTFE tube connections in test rigs or custom pneumatic setups, with straightforward operation.