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Cruise control check valve 84-2019

GM used the type of design Cruise control check valve for 3 decades at least.

Three way T piece.

There are two designs.. you could have either and either are the same function.

Fits years 

CADILLAC 1990-1994
CHEVROLET 1983-2019
GMC 1983-2020
OLDSMOBILE 1984-2001
PONTIAC 1984-2001