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 800062 Tube Holder Housing End, 1/2" for 6mm OD Price on request F-PRO-1218 Universal Tube Holder System - Instruction Manual Price on request