Used brass fitting found on intake manifolds 1966-69 Mercury Cougar and Ford Mustang. Screws into the rear of the intake manifold directly. With 2 vacuum ports 3/16' and 1/4" for various accessories and a threaded port for the hard line going to the brake booster. Found on some small blocks and big blocks.
Replaces Ford part number C6AZ-9A474-A.