Sorbent Tube, Porapak-N, 6X70, 88/44, 50/BX Back Catalog number: 811-9981-50 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 800253 Single Variable Flow Kit, 6 x 70mm (Standard Charc Price on request 800231 Tube Holder Kit, Quad Variable, 6 x 70mm Price on request 800251 Tube Holder Kit, Dual Variable Manifold (Includes Price on request