1/2 x 1/2 Nylon Air Brake Male Run Tee with Roll Tube StopThe 1 2 Tube Outer Diameter x 1 2 Male NPTF x 1 2 Tube Outer Diameter Nylon Air Brake Run Tee with Roll Tube Stop is a high quality brass fitting designed for secure and efficient air brake and pneumatic system connections. The Roll Tube Stop (RTS) feature ensures precise tube insertion, preventing over insertion and ensuring a leak free and vibration resistant connection. Specification Details TYPE Nylon Air Brake Male Run Tee with Roll Tube Stop