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Pyrex® & Witeg® High Vacuum Stopcock, T-Bore, 3-way, Glass PlugMade of Borosilicate Glass 3.3, Construction, 고진공용 삼방 콕 Pyrex® & Witeg® High Vacuum Stopcock, T-Bore, 3-way, Glass PlugMade of Borosilicate Glass 3.3, Construction, 고진공용 삼방 콕