Tube Holder Quad Variable Flow, only Back Catalog number: 800075 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9962-50 Sorbent Tube, Chromosorb-102, 8X110, 100/50, 50/BX Price on request 800230 Triple Variable Tube Holder Kit, 6 x 70mm Price on request 200187 Tube Holder Adapter, 3/16" to 1/4" Ends Price on request