STN-2.5 sampling tubes are metal tubes with a notch for use with SL- and RT- series detectors.
AAI Sampling Tube, Series: STN Series, Metal, Silver, 152.44 mm Diameter, 762 mm Length, For Use With: SL- and RT- Series Detectors, Additional Information: 15 mm ID x 18 mm OD x 3 ft L Pipe
- 2.5 ft notched sampling tubes for use with the SL or RT series duct smoke detectors
- For duct widths of 12 in to 3 ft
- Designed and manufactured in the USA