Tube Holder Kit, Dual Variable Manifold (Includes Back Catalog number: 800251 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9974-50 Sorbent Tube, XAD-2, 8X110, 150/75, 50/BX Price on request 800073 Tube Holder Dual Variable Flow, only Price on request 800497-1 Tube Breaker Kit, Blue, LFS-113 Price on request