Tube Holder Kit, Dual Variable Manifold (Includes Back Catalog number: 800251 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 800261 Single Tube Holder Kit, 7-10 x 175mm Price on request 811-9973-50 Sorbent Tube, XAD-2, 8X110, 100/50, 50/BX Price on request