Tube Holder Quad Variable Flow, only Back Catalog number: 800075 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9976-20 Sorbent Tube, XAD-2, 6X110, 150/75, 20/BX Price on request 800261 Single Tube Holder Kit, 7-10 x 175mm Price on request 800062 Tube Holder Housing End, 1/2" for 6mm OD Price on request