Single Tube Holder Kit, 7-10 x 175mm Back Catalog number: 800261 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 800063 Tube Holder Housing End, 1/2" for 5mm OD Price on request 171SC Formaldehyde 0.05-4.0 ppm Gas Detector Tube, pk/10 Price on request 800254 Single Variable Flow Kit, 5 x 150mm [Kitagawa TWA Price on request