Tube Holder Kit, Dual Variable Manifold (Includes Back Catalog number: 800251 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9965-50 Sorbent Tube, Silica Gel, 6X70, 150/75, 50/BX Price on request 800064-10 Tube Holder Housing End, 5/8", for 7-10mm (Packg o Price on request 800231 Tube Holder Kit, Quad Variable, 6 x 70mm Price on request