Tube Holder Kit, Dual Variable Manifold (Includes Back Catalog number: 800251 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 800260 Single Tube Holder Kit, 7-10 x 150mm Price on request 200187 Tube Holder Adapter, 3/16" to 1/4" Ends Price on request