This 1967-1970 Mustang 9" Chrome Single Diaphragm Brake Booster, (includes Push Rod Boot & Check Valve) is an exact duplicate of the original finsih and includes the pushrod boot and check already installed.
With this vacuum level the booster will produce a maxium pressure output of 1100 psi with a 1" bore master cylinder. This pressure level will work great for disc/drum vehicles.
This booster is recommended for heavy disc brake cars like 55 chevy's or for street rods.
The 9" booster requires 18" of vacuum to operate properly.