Single Variable Flow Kit, 6 x 70mm (Standard Charc Back Catalog number: 800253 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9983-50 Sorbent Tube, Porapak-Q 6X110, 150/75, 50/BX Price on request 400253 Tube Holder, Clear Storage Box Price on request 800062-10 Tube Holder Housing End, 1/2" for 6mm OD (Packg of Price on request