Product Details: The Tramec 1/2"-14 FPT Tractor Port In-Line Quick Release Valve is the perfect solution for quickly releasing air pressure from the trailer brake lines. This valve is designed to be installed on the service side gladhand of double- and triple-axle trailers, allowing for a faster release of the trailer service brakes. The valve is constructed from durable materials and is designed to provide reliable performance. With its easy installation and simple operation, it is the perfect choice for any trailer owner. FleetPride is your First Click in Heavy Duty®.