Compatibility: fit use 1.75mm Filament 3D Printer and other devices.
Easy to use: Inside the pneumatic fitting has metal clasps, that can hold the tube locked in, so hold down the blue or black part on top of the pneumatic fitting and Insert/pull out the tube.
PC4-M6 pneumatic fitting: made of copper and plastic material, Thread: 6 mm, inner diameter(blue end): 4mm, fit the outer diameter 4mm tube.
PC4-M10 fitting: made of stainless steel and plastic material, Thread: 10 mm, inner diameter(black end): 4mm, fit the outer diameter 4mm tube.
The 3D Printer extruder use PC4-M6 Pneumatic Fitting, the hotend use PC4-M10 Pneumatic Fitting, and Pneumatic Fitting does not burr inside blocking or interfere with the filament.