This fits under the filament run-out detector on the CR5. The PTFE tube runs from the dry box and connects to a PC4-M10 connector attached to the feed end. Screw the connector onto the feed end and then use 12mm M3 button head bolts with corresponding 1.8mm thick square nuts to secure the end to the feed bar. You can still manually feed the filament by pulling on the filament between the run-out detector and the extruder.