Tube Holder Dual Variable Flow, only Back Catalog number: 800073 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9972-50 Sorbent Tube, TenaX, 8X110, 100/50, 50/BX Price on request 800139 Tube Holder Adapter for 1/2" Ends Price on request 200486 Tube Holder Tubing, 1/4" ID x 1/16" W (10 ft) Price on request