Tube Holder Triple Variable Flow, only Back Catalog number: 800074 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9969-20 Sorbent Tube, Silica, DNPH, 6X110, 300/150, 20/BX Price on request 800071-10 Tube Holder Housing End, 5/8", for 1/4" OD, Open E Price on request 800251 Tube Holder Kit, Dual Variable Manifold (Includes Price on request