Tube Holder Dual Variable Flow, only Back Catalog number: 800073 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 800231 Tube Holder Kit, Quad Variable, 6 x 70mm Price on request 800071 Tube Holder Housing End, 5/8", for 1/4" OD, Open E Price on request 811-9977-20 Sorbent Tube, XAD-2, 6X110, 120/60, 20/BX Price on request