Intake manifold grommet for PCV valve also known as positive crankcase ventilation.
Dimensions: 0.418" ID x 1.299" OD x 0.5" Thickness
Fits the following Cadillac vehicles equipped with Buick engines:
Deville 1980-1982
Eldorado 1981-1982
Fleetwood 1980-1982
Seville 1981-1982