Penny head hollow glass stopper with closed bottom, grounded, used for any apparatus with standard ground taper outer joint.
If you need any other size or other Ground joints,please contact with us
Handle blowing by the glass blowers,not made by the Pouring
If the item will be broken in the delivery process,we will send the replacement to you right now.
Be Made From G3.3 Borosilicate Glass
Annealing Point ------560℃
Linear Coefficient of Expansion------ 33×10-7/℃
Softening Point------820℃