Adapter has a 0-4mm  valve between the top outer and lower inner joints, both of which are the same size. having the valve mounted in-line,Overall length of the 14/20 size is approx 135mm while the 24/40 is approx 190mm.

If you need any other size or other Ground joints,please contact with us

Be Made From G3.3 Borosilicate Glass

Annealing Point ------560℃

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

Softening Point------820℃