Tube Holder Quad Variable Flow, only Back Catalog number: 800075 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9964-50 Sorbent Tube, Microlite, 8X110, 500mg, 50/BX Price on request 800251 Tube Holder Kit, Dual Variable Manifold (Includes Price on request 800261 Single Tube Holder Kit, 7-10 x 175mm Price on request