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Rotaflo® 10-9 Torr 3-Way Stopcock, Made of Borosilicate Glass α3.3With 2 PTFE Valves, , 3방 고진공 Teflon 니들밸브/콕 Rotaflo® 10-9 Torr 3-Way Stopcock, Made of Borosilicate Glass α3.3With 2 PTFE Valves, , 3방 고진공 Teflon 니들밸브/콕