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PYREX® Rotaflo® Premium High-Vacuum 3-Way Stopcock, with 2 PTFE Valves, 10-9 Torr Made of Borosilicate Glass α3.3, <UK-Made> 3방 고진공 Teflon 니들밸브/콕 PYREX® Rotaflo® Premium High-Vacuum 3-Way Stopcock, with 2 PTFE Valves, 10-9 Torr Made of Borosilicate Glass α3.3, <UK-Made> 3방 고진공 Teflon 니들밸브/콕