SVL� Glass Screw Thread Tube, SVL� 30 thread

SVL� Glass Screw Thread Tube, SVL� 30 thread
Manufactured from 3.3 expansion borosilicate glass complying with ISO 3585 (ASTM E-438 Type 1 Class A)
The unique SVL� thread is a finer thread compared to GL thread
For use by glassblowers to construct apparatus with SVL� threaded joints
N.B.: SVL� threads are not compatible with GL threads