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