$5.00 This parts is used to obtain vacuum (usually for advance) off the rear of the center carb. Brass. SKU: 57-66VN-166 Image: Catalog: 1957 Tripower 1958 Tripower 1959 Tripower 1960 Tripower 1961 Tripower 1962 Tripower 1963 Tripower 1964 Tripower 1965 Tripower 1966 Tripower Carburetor Parts Vacuum Related Price: $5.00