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 811-9973-50 Sorbent Tube, XAD-2, 8X110, 100/50, 50/BX Price on request F-PRO-1218 Universal Tube Holder System - Instruction Manual Price on request 800249 Tube Holder Kit, Quad Variable (Includes 6x70mm, 7 Price on request