Tube Holder Kit, Quad Variable, 6 x 70mm Back Catalog number: 800231 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9974-50 Sorbent Tube, XAD-2, 8X110, 150/75, 50/BX Price on request 800139 Tube Holder Adapter for 1/2" Ends Price on request 800259 Single Tube Holder Kit, 7-10 x 110mm Price on request