Lower outlet is a standard taper inner joint and has a CG-961-01 0-4mm Chem-Vac™ Chem-Cap® valve. Top outer joint is the same size as the lower inner joint. Available with a choice of a 2mm high vacuum glass stopcock having a S.S. constant pressure retaining device or a 0-4mm Chem-Cap® Airfree® inlet valve.