Tube Holder Collar Clip, for 1/2" OD, 3/8" ID Tubing Back Catalog number: 800135 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9980-50 Sorbent Tube, XAD-7, 6X70, 60/30, 50/BX Price on request F-PRO-1218 Universal Tube Holder System - Instruction Manual Price on request 800063-10 Tube Holder Housing End, 1/2" for 5mm OD (Packg of 10) Price on request