Tube Holder Single Variable Flow, only Back Catalog number: 800072 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9978-20 Sorbent Tube, XAD-2, 8X110, 450/225, 20/BX Price on request 800149 Single Tube Holder Kit, 6 x 70mm (Standard Charcoa Price on request 200486 Tube Holder Tubing, 1/4" ID x 1/16" W (10 ft) Price on request