This valve ball (check ball) controls the flow of fuel from the accelerator pump to the accelerator pump jet in the Weber DCOE carburetor. The tiny 0.155" steel ball can easily go missing during a rebuild.
Sold individually; 2 required per carburetor.
Note: Fits genuine Weber (made in Italy or made in Spain) carburetors only! Does not fit most copies, Asian knock-offs, or work-alikes.