Purge and Trap glassware from CRS uses precision ground heavy-wall tubing on all parts, for strength and accurate fit. Glassware is designed for Tekmar® instruments. Glassware is made by a special fixture-based process which affords remarkable consistency piece-to-piece. The tops are fire-polished for smoothness. Complete Kits include the sparger, replacement needle (stainless steel tube), plastic hand-tightened nut and ferrule.