Product Details: The OTR FF2 Full Function Trailer Valve ensures Expertise Built In™, as an optimal and reliable brake solution. This OTR full function trailer valve combines pressure protection, check valves, and spring brake quick release functions in one component. This OTR trailer valve offers easy installation, maintenance, and troubleshooting. Additionally, this OTR trailer valve complies with FMVSS-121 standards with pressure protection, anti-compounding functions, and corrosion protection. In the end, this heavy duty trailer valve ensures safe and sufficient air tank pressure for optimal air brake system performance. FleetPride is your First Click in Heavy Duty®.