FITS ALL 123 chassis cars from 1977 to 1985 and ALL 126 Chassis cars from 1981-1991, both Gasoline and Diesel models! If you are not sure of your application just pop your hood to see if you have one inline on the drivers side of the engine compartment. This check valve helps to hold vacuum in your door lock system. If not working properly vacuum can leak out of the system after you shut the engine off. Check by blowing and then sucking on the check valve. Air should only pass one way.
123 126 Vacuum Check Valve (yellow)