Tube Holder Dual Variable Flow, only Back Catalog number: 800073 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9975-50 Sorbent Tube, XAD-2, 8X110, 400/200, 50/BX Price on request 400253 Tube Holder, Clear Storage Box Price on request 800254 Single Variable Flow Kit, 5 x 150mm [Kitagawa TWA Price on request