800960 | Genuine International® Trailer Control Valve

Functions: 
Parking brake: The valve may also be involved in engaging and releasing the trailer's parking brake.
Air pressure control: The primary function of the valve is to regulate the flow of compressed air to the trailer's braking system.
Emergency braking: In case of an emergency, the valve can activate the trailer's brakes independently from the towing vehicle's brakes.
Service braking: During normal braking, the valve ensures proper distribution of air pressure to both the towing vehicle and trailer brakes for coordinated stopping.

Navistar International Corporation is an American company specializing in the production of trucks, buses, diesel engines and other transport equipment. They are known for their products for various industries including logistics, construction and public transport. The company is also actively working on the development of electric and hybrid solutions for the transport industry.