Elevate Tractor-Trailer Safety with Tectran's Dash Valve - Model 7 -Reliable Control: The Model 7 dash valve is a pressure-sensitive, on/off control valve designed to ensure dependable operation of your tractor-trailer -Automatic Functionality: This valve automatically returns to the exhaust position when supply pressure falls below the required minimum, streamlining its operation for added convenience -Manual Override: When pressure exceeds the minimum requirement, you can manually operate the Model 7 valve to either position, providing you with flexibility and control -Tractor Protection: The Model 7 valve plays a crucial role in controlling the tractor protection system and serves as the trailer air supply valve -Interlocking Safety: Featuring an air-operated interlock in the lower body, this valve ensures that when the tractor spring brakes are applied, the trailer brakes are also applied. This safety interlock aligns with FMVSS 121 requirements, enhancing the overall safety of your tractor-trailer -Trailer Supply Valve: The Model 7 also serves as a Trailer Supply Valve, automatically releasing at 40 psi for added safety and convenience Upgrade your tractor-trailer's safety and control with Tectran's Dash Valve - Model 7. Count on its reliability, automatic functionality, and robust safety features to enhance your on-road experience.