The John Guest Angle Stop Adapter Valve is a plastic tee-shaped stop valve designed for plumbing and home improvement projects. This valve, with a 3/8" x 3/8" x 1/4" width, allows for easy installation and meets AB1953 standards for safety and performance. The set includes one adapter, making it a convenient addition to any home or garden plumbing system needing a stop valve with these specific dimensions.