Tube Holder Housing End, 5/8", for 1/4" OD, Open End Back Catalog number: 800071 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9988-10 Sorbent Tube, Chromosorb-106, 10X150, 600/300, 10/BX Price on request 800232 Tube Holder Kit, Deluxe (Single, Dual, Triple & Quad, all sizes) Price on request 800075 Tube Holder Quad Variable Flow, only Price on request