Tube Holder Dual Variable Flow, only Back Catalog number: 800073 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 800261 Single Tube Holder Kit, 7-10 x 175mm Price on request 106SC Carbon Monoxide 1-50 ppm Gas Detector Tube, pk/10 Price on request 200113 Tube Holder Housing, 7-10 x 110mm, 5/8", L240 Price on request