A 1:5 taper PTFE plug having double "V", 90º bores to connect opposite sets of adjacent arms. Configuration of stopcock allows it to be used in a system to obtain reversal of flow.

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Be Made From G3.3 Borosilicate Glass

Annealing Point ------560℃

Linear Coefficient of Expansion------ 33×10-7/℃

Softening Point------820℃

All of our glassware made by the glass blowers,not the poor glass,Please do not make the comparison with other's glass