Tube Holder Single Variable Flow, only Back Catalog number: 800072 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9902-20 Charcoal Tube, Coconut Shell, Large, 200/400mg, 8x Price on request 811-9981-50 Sorbent Tube, Porapak-N, 6X70, 88/44, 50/BX Price on request 811-9977-20 Sorbent Tube, XAD-2, 6X110, 120/60, 20/BX Price on request