This is an important little inline Filter used on various GM Applications in the AC system and often overlooked. It also harbors residue and contamination of those changing over gas systems. Your average repairer may overlook this part.
It's there for a reason & is a service part.
This is a genuine GM Ac Delco Part
PONTIAC - 1967-91
Fiero - 84-88
Firebird TA - 67-88
Bonneville/ Full size various 71-88
CHEVROLET: 66-98
Impala Full Size 1969-72 Various
Camaro 1982-99 Various