Tube Holder Dual Variable Flow, only Back Catalog number: 800073 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9962-50 Sorbent Tube, Chromosorb-102, 8X110, 100/50, 50/BX Price on request 800064 Tube Holder Housing End, 5/8", for 7-10mm Price on request 106SC Carbon Monoxide 1-50 ppm Gas Detector Tube, pk/10 Price on request