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 |