Tube Holder Quad Variable Flow, only Back Catalog number: 800075 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 800063 Tube Holder Housing End, 1/2" for 5mm OD Price on request 800231 Tube Holder Kit, Quad Variable, 6 x 70mm Price on request 800165-10 Sorbent tube adapter nipple for Dual manifold High Price on request