New idle jet holder for the idle jet on a Weber carburetor. Installed to replace a missing holder, and can also replace the anti-diesel solenoid on older "smog-legal" model Weber carburetors. Features 11mm diameter head and M8 x 1.0 threads. (Optional: We also carry the smaller 8mm diameter head, M6 x 1.0 threads, most commonly used for the secondary jet). Includes "O" Ring.