Tube Holder Single Variable Flow, only Back Catalog number: 800072 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9970-50 Sorbent Tube, Silica (Spec Clean), 7X110, 50/BX Price on request 800249 Tube Holder Kit, Quad Variable (Includes 6x70mm, 7 Price on request 800232 Tube Holder Kit, Deluxe (Single, Dual, Triple & Qu Price on request