This is the bolt that holds the accelerator pump jet (sold separately) in place in Weber IDF carburetors. It looks like a plugged banjo bolt, but it houses a one-way check valve for the accelerator pump circuit. If the valve sticks closed, the accelerator pump circuit will be clogged. If it sticks open, raw fuel may be pulled into the carb throat under vacuum, causing a difficult-to-diagnose rich running condition. Sold individually; each carburetor requires 2.
Fits Weber 40 IDF, 44 IDF, and 48 IDF only.
Note: Fits genuine Weber (made in Italy or made in Spain) carburetors only! Does not fit most copies, Asian knock-offs, or work-alikes.