Tube Holder Dual Variable Flow, only Back Catalog number: 800073 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9967-50 Sorbent Tube, Silica Gel, 8X110, 300/150, 50/BX Price on request 800261 Single Tube Holder Kit, 7-10 x 175mm Price on request 800064 Tube Holder Housing End, 5/8", for 7-10mm Price on request