Tillotson Carburetors build the first diaphragm carburetor in the '50s and since they have to build many different carburetor sizes for thousands of applications.

EC Carburetors has the largest inventory of Tillotson throttle shutters in the US.

14A-66 OE Tillotson Throttle Shutter for 1.125" bore carburetors

Fits HL-380A, HL-380B