#5.5 stopper - with 3/8 inch hole. Top diameter 28 mm ( 1.11 inches ), bottom diameter 24 mm ( 0.95 inches ), length 25mm ( 1 inch ).

BPA-free stopper made of food-grade materials. Injection molded TPE for superior consistency throughout. Perfect for use with carboys, as the material sticks well to glass and PET, even when wet.