Adjustable Carburetor Vacuum Secondary Housing Assembly; Made From Quality Die-Cast Aluminum and Fits 4160 Model Carbs. One Screw Adjustment with Chrome Plated Finish. This is a complete bolt-on for any vacuum secondary carburetor. A simple one-screw adjustment varies initial point and opening rate. Sold Individually.
Product Details:

• Adjustable Carburetor Vacuum Secondary Housing Assembly
• Made From Quality Die-Cast Aluminum
• Fits 4160 Model Carbs
• One Screw Adjustment
• Chrome Plated Finish
• Sold As Each