Carburetor Vacuum Secondary Diaphragm with 2.054" Rod Length

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The Edelbrock #12404 Vacuum Secondary Diaphragm is a replacement service part for popular high performance Quick Fuel, Holley and Demon carburetors.


Availability Available
Mounting Hole Quantity 4
Grade Type Performance
Mounting Hole Diameter 0.200 in
Shaft Thickness 0.171 in
Shaft Length 2.054 in
Diaphragm Material Rubber
Application Universal
UPC 00085347124046
Availability Note Available to Order
Emissions Code N/A
Hazardous Materials Warning WARNING: This product can expose you to Chrome, which is known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit
Installation Notes
  • A fuel filter MUST be installed between the fuel pump and the carburetor
  • Proper installation is the responsibility of the installer. Improper installation will void your warranty and may result in poor performance and engine or vehicle damage