OER 326187 Features:

Reproduction door vent pressure relief valve also known as door vent grill for 1973-82 C/K truck, 1987-91 R/V truck, and 1973-91 Blazer/Jimmy and Suburban models. Manufactured in injection-molded plastic, as original, each valve is produced to mimic the original part in both appearance and functionality. The valve mounts in the lower portion of the door to relieve the pressure in the cab of the truck when closing the doors. The door pressure relief valve is engineered to make it easier to close the doors of the vehicle when the windows are rolled up. This valve fits the front doors on all 2-door models, and the front and rear doors on all 4-door models. Sold individually. Use as required. Replaces OE part numbers 326187.