CAT 9X-0397 cabin air diffuser, also recorded as 9X0397, for directing conditioned airflow into the cab.Original supplied function and application referenceCabin Air Diffuser regulates airflow, improves air quality, and distributes conditioned air evenly in the cabin. TRUCK 769C 777C 773B QUARRY TRUCK 771C 775B TRACTOR 776C 772B 768C The source’s air-quality and airflow statements describe intended function, not measured performance for this stock. No filtration or air-purification capability is established. This listing is for a diffuser/vent component, not a complete air-conditioning system.Confirm the machine serial number, cab configuration, mounting dimensions and required vent position before ordering. The original title describes a genuine CAT part; confirm the stock label, condition and included fixings with MIS.