Used brass fitting found on intake manifolds 1966-67 Mercury Cougar and Ford Mustang. Screws into the rear of the intake manifold directly. With 3 vacuum ports 3/16' and 1/4" for various accessories and a threaded port for the hard line going to the brake booster. Bob Mannel's book indicates that this vacuum fitting was for A/C and Thermactor smog.
Replaces generic Ford vacuum fitting part number 9A474.