1967 Only Pontiac, GTO, Lemans 4bbl Power Brake Carb Booster Vacuum Fitting 1pc Screws into back of carb base plate to connect power booster line. This is a exact inline tube reproduction. This hard line fitting goes into the back of the carb to accept the hard line to the flex hose off the booster and is clamped at the valve cover on the small stand up bracket with a clip.