Ensuring Expertise Built In , the OTR FF2 Full Function Trailer Valve is a durable and reliable brake solution with superior OEM quality performance. This OTR trailer valve utilizes a single valve system for installation, maintenance, and troubleshooting ease. Additionally, this OTR full function trailer valve offers pressure protection and anti-compounding functions with FMVSS-121 compliance to minimize damage caused by compounding. The technology behind this OTR trailer valve features durable, lightweight material that resists corrosion for extended life. In the end, this heavy duty trailer valve ensures safe and sufficient air tank pressure for high-quality performance and stopping power. FleetPride is your First Click in Heavy Duty .