Stopcock has a solid glass plug having parallel diagonal bores. Both sizes are supplied complete with metal retaining clip 

If you need other size,please contact us by the leave a message

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