Features 20Pcs in Total: There are 10pcs PC4‑M6 fitting for extruder, and 10pcs PC4‑10 fitting for hot end, the replacement is easier. Reliable Works: Allows for quick connection, the pneumatic fittings can withstand greater impact without falling off. Extensive Uses: Suits perfectly for Ender 3, for 3 Pro, for 3 V2, for Ender 5, for 5 Pro, for 5 Plus CR‑10. Good Materials: The PC4‑M6 fitting is made of brass, while the C4‑10 fitting is made of stainless steel. Has high hardness, very durable with oxidation and corrosion. Easy to Install: The upper part can be inserted into the outer diameter 4mm PTFE tube and self locking, very easy to install. Feature: 1. 20Pcs in Total: There are 10pcs PC4‑M6 fitting for extruder, and 10pcs PC4‑10 fitting for hot end, the replacement is easier. 2. Reliable Works: Allows for quick connection, the pneumatic fittings can withstand greater impact without falling off. 3. Extensive Uses: Suits perfectly for Ender 3, for 3 Pro, for 3 V2, for Ender 5, for 5 Pro, for 5 Plus CR‑10. 4. Good Materials: The PC4‑M6 fitting is made of brass, while the C4‑10 fitting is made of stainless steel. Has high hardness, very durable with oxidation and corrosion. 5. Easy to Install: The upper part can be inserted into the outer diameter 4mm PTFE tube and self locking, very easy to install. How to Use: 1. Installation: Connect with the male thread of the quick connector.  2. Disassembly: Press and hold the blue or black end of the quick connector and pull out the tube.  Specification: Item Type: 3D Printer Pneumatic Fitting Model: PC4-M6, PC4-10 PC4-M6 Thread: Approx. 6mm / 0.24in PC4-M6 Inner Diameter (Blue End): Approx. 4mm / 0.16in PC4-M6 Material: Brass PC4-M10 Thread: Approx. 10mm / 0.39in PC4-M10 Inner Diameter (Black End): Approx. 4mm / 0.16in PC4-M10 Material: Stainless Steel + Plastic Compatibility: Suitable for 3D printer 1.75mm filament and other devices. Application: For Ender 3, for 3 Pro, for 3 V2, for Ender 5, for 5 Pro, for 5 Plus CR-10.  Package List: 10 x PC4-M6 3D Printer Pneumatic Fitting 10 x PC4-10 3D Printer Pneumatic Fitting Package List 10 x PC4-M6 3D Printer Pneumatic Fitting 10 x PC4-10 3D Printer Pneumatic Fitting