Heavy duty PSI blower snout quill shaft. Quill shaft is made from heat treated steel and allows the rotor gear coupler to be coupled to the blower snout. This is a part that every racer should carry a spare as they do need to be replaced from time to time.
The only length available is 4.025" which is standard for the current C or D series blower. Be sure to measure the quill shaft or now what model blower you have when ordering.