Product#: TG-3980 Availability: This item normally ships within 1 - 2 business days. Description: Graduated distillation receiver with a 4 mm three way TeflonŽ stopcock to permit solvent removal through the 10 mm OD tube or return to distillation flask. Upper sampling port has a 2 mm TeflonŽ stopcock. The top outer and lower inner standard taper joints are of the same size. Other joint sizes available upon request.