Sampling Tube, Finish Steel, Duct Mounting, Depth (In.) 5/8 in, Height (In.) 5/8 in, Length (In.) 10 ft, Tube Length (Ft.) 10 ft, Width (In.) 5/8 in, Duct Width (Ft.) 5 to 10 ft, For Use With SL and RT Series Smoke Detectors