Vintage Edelbrock Uni-Syn Model A carburetors internal engine tool. This multiple carburetor synchronizer is a classic automotive specialty tool designed to help balance the air flow on multi-carb setups for maximum power and performance. Includes: – Original Edelbrock Uni-Syn Model A Tool – Vintage original retail box – Original instruction manual Condition: Good pre-owned vintage condition. The tool shows light age-related oxidation and minor wear consistent with use. The glass tube and red float are intact. The box shows some shelf wear and edge scuffing as pictured. Perfect for vintage car restoration enthusiasts or collectors of mid-century automotive tools.