Single Tube Holder Kit, 6 x 70mm (Standard Charcoa Back Catalog number: 800149 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9970-50 Sorbent Tube, Silica (Spec Clean), 7X110, 50/BX Price on request 200187 Tube Holder Adapter, 3/16" to 1/4" Ends Price on request 800261 Single Tube Holder Kit, 7-10 x 175mm Price on request