Sorbent Tube, Porapak-N, 6X70, 88/44, 50/BX Back Catalog number: 811-9981-50 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9902-50 Charcoal Tube, Coconut Shell, Large, 200/400mg, 8x110mm, with end caps, 50Pack Price on request 800231 Tube Holder Kit, Quad Variable, 6 x 70mm Price on request 800238 Tube Holder O-Ring Kit Price on request