Kjeldahl, Pressure/Vacuum Stopcock - Consists of outer joint and 2 mm pressure/vacuum stopcock on Kjeldahl style flask.

Round Bottom, Pressure Vacuum Stopcock - Consists of an outer joint and 2 mm pressure/vacuum stopcock on round bottom flask.

Round bottom, pressure vacuum stopcock - Consists of two outer joints and 2 mm pressure/vacuum stopcock on round bottom flask.

14/20 outer joint, 2 mm double oblique stopcock at bottom and pressure/vacuum stopcock on side arm.