Tube Holder Kit, Quad Variable (Includes 6x70mm, 7 Back Catalog number: 800249 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9983-50 Sorbent Tube, Porapak-Q 6X110, 150/75, 50/BX Price on request 800063 Tube Holder Housing End, 1/2" for 5mm OD Price on request 800071 Tube Holder Housing End, 5/8", for 1/4" OD, Open E Price on request