Pneumatic Connector PC4-M6 (2 Pieces)
$ 2.78
2 pieces of pneumatic connector (Extruder), PC4-m6. Suitable for most Creality 3D printers. Noted: CR10 Max Bondtech Double Gear Extruder is using the other size of the pneumatic connector: https://builditfull.com/site/product/pneumatic-connector-hotend/