Tube Holder O-Ring Kit Back Catalog number: 800238 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9972-50 Sorbent Tube, TenaX, 8X110, 100/50, 50/BX Price on request 800073 Tube Holder Dual Variable Flow, only Price on request 800254 Single Variable Flow Kit, 5 x 150mm [Kitagawa TWA Price on request