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Premium High-Vacuum Stopcock, PTFE Needle valve, Straight-type Made of Borosilicate Glassα3.3, 고진공 Teflon 니들밸브/콕 Premium High-Vacuum Stopcock, PTFE Needle valve, Straight-type Made of Borosilicate Glassα3.3, 고진공 Teflon 니들밸브/콕