Product Details: Equip your semi truck with devices with Expertise Built In™, with the OTR TEV Style Trailer Emergency Valve, a crucial component that provides enhanced control of a trailer's brake systems. This replacement valve plays a key role in the stopping or slowing down of a cargo load, thanks to its ability to activate or deactivate the brake systems. Crafted with a durable construction to provide long-lasting performance. FleetPride is your First Click in Heavy Duty®.