Tube Holder Adapter for 1/2" Ends Back Catalog number: 800139 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9981-50 Sorbent Tube, Porapak-N, 6X70, 88/44, 50/BX Price on request 811-9972-50 Sorbent Tube, TenaX, 8X110, 100/50, 50/BX Price on request 811-9962-50 Sorbent Tube, Chromosorb-102, 8X110, 100/50, 50/BX Price on request