Tube Holder Dual Variable Flow, only Back Catalog number: 800073 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 800136 Tube Holder Collar Clip, for 5/8" OD, 1/2" ID Tubi Price on request 811-9971-50 Sorbent Tube, Silica (H2SO2), 6X70, 150/75, 50/BX Price on request 800071 Tube Holder Housing End, 5/8", for 1/4" OD, Open E Price on request