14/20 inner standard taper lower joint; 19/22 inner standard taper lower joint; 24/40 inner standard taper lower joint Upper joint fits on StonyLab Pluro stopper size #5 Compatible with StonyLab 12mm (15/32 inch) O.D. 8mm (5/16 inch) I.D. vacuum tubing Borosilicate glass, heavy duty and reusable Warranty: StonyLab 1-year limited warranty; if received damaged, please contact us immediately; we will solve it until satisfied