The Auxiliary (or Secondary) Venturi is designed to accelerate airflow through the carburetor throat. This helps pull fuel from the float bowl at low engine speeds, as well as contributing to off-idle throttle response. Fits Weber 40 DCOE only. Two required per carburetor; sold individually.
Note that this part is the later "grub screw" type. It is held in place by a set screw (not included) threaded in from the outside of the carburetor body. It is not interchangeable with the earlier "clip retained" style (Weber # 70003). The early style fit "Made in Italy" 38 /40 / 42 DCOE, but this late style only fits the later "Made in Spain" 40 DCOE.
Note: Fits genuine Weber (made in Spain) carburetors only! Does not fit most copies, Asian knock-offs, or work-alikes.
