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Continue to ChatPC4-M6 Pneumatic Connector With 2M PTFE Teflonto Tube 2*4MM For ender 3 Upgrade Kit 3D Printer Parts 1.75mm Bowden Extruder https://pr-3dprinter.myshopify.com/products/pc4-m6-pneumatic-connector-with-2m-ptfe-teflonto-tube-2-4mm-for-ender-3-upgrade-kit-3d-printer-parts-1-75mm-bowden-extruder