Tube Holder Housing End, 5/8", for 1/4" OD, Open E Back Catalog number: 800071 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 200187 Tube Holder Adapter, 3/16" to 1/4" Ends Price on request 200102-10 Tube Holder Housing, 6x70mm, 1/2" OD, S225 (Packg Price on request 811-9984-50 Sorbent Tube, Porapak-R 6X70, 70/35, 50/BX Price on request