1960's AC VINTAGE ORIGINAL GM POSITIVE CRANKCASE TESTER (PCV) OEM. Have one CT-1 and one CT-3, your choice same price $45 for both. Includes instructions. This item appears to be never used. Does not include original cardboard box. Great collectible Automobile Memorabilia I am helping my friends widow sell his antique car parts, all proceeds to widow. Chevrolet, Pontiac, Oldsmobile, Buick, Cadillac