This assembled replacement stock hotend from Creality is a plug and play replacement or spare unit for Creality brand printers including Ender series printers. Also included are some extra brass nozzles, a hotend sock and upgraded PTFE tubing which drastically improves the performance of this part over its standard PTFE option. Pluggable: the heating tube and temperature thermistor that from control box, connect them with terminal housing and pin. Then you could plug the hotend kit, easier to replace hotend kit. With more terminal housing and pins as spare parts, in case fail installation and waste . MK8 Extruder Hot End kit, white wire was temperature thermistor, braided wire was heating tube 24V40W. Upgraded Pneumatic fittings with metal teeth provided in this package work much better than the stock options provided by many cheap 3D printer manufacturers with plastic teeth or cheap locking mechanisms. The extruder fitting is a PC4-M6 and the hotend fitting is PC4-M10. These are the standard sizes for most open source 3D printers and the same sizes used by most Chinese manufacturers.