With standard taper top outer and lower inner joints with sealed in lower tube extending below inner joint. Tubing extends 100mm below the joint on the 14/20 and 19/22 sizes and 200mm on the 24/40, 29/42 sizes. Serrated hose connection having an O.D. of 10mm at the largest serration for connection to vacuum source.

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℃