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Cowie® PTFE Stopcock, with Screw-locking systems, for Vacuum(5mmHg)/Pressure(1bar)Good Chemical/Corrosion Resistance, for Tubing and Hose, , PTFE 밸브/콕, Screw식 Cowie® PTFE Stopcock, with Screw-locking systems, for Vacuum(5mmHg)/Pressure(1bar)Good Chemical/Corrosion Resistance, for Tubing and Hose, , PTFE 밸브/콕, Screw식