The product is plug-in elbow push-to-connect fitting, composite, 1/4 inch push-to-connect tube x 1/4 inch plug-in stem tube. It features D.O.T. Quick connect push-in fittings for repairing truck and trailer air brake lines, for use in air brake systems on semi-trucks, trailers, buses, mobile equipment and farm implements, use in secondary air applications such as Pneumatic Doors for rail, air seats, shock absorbers and in Cab instruments, composite body - strong, lightweight, compact and impact resistant, PCT. Fittings reduce assembly time over compression style fittings by 90 percent.