Tube Holder Single Variable Flow, only Back Catalog number: 800072 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9985-50 Sorbent Tube, Florisil, 6X70, 100/50, 50/BX Price on request 800073 Tube Holder Dual Variable Flow, only Price on request 800259 Single Tube Holder Kit, 7-10 x 110mm Price on request