American Maid Replacement Water Bottle Caps 2 Pack 53mm for 3 or 5 gallon jugs IMPORTANT: Before ordering, please be sure that the opening to your water bottle is 53 mm. These caps will only fit a 53 mm opening. These twist-off American Maid Replacement Bottle Caps will fit any standard 3-gal or 5-gal water bottle with a 53 mm opening. These bottle caps are 53 mm diameter and are twist-off threaded. Throw away your old top and replace it with one of these BPA-free stoppers. These water bottle caps screw on tightly to prevent spills. Wash by hand before using them and after each reuse. Using a clean, quality cap keeps your drinking water more potable. Keep a set of these handy in case you lose the caps that came with your bottles. Two caps are included in each package. American Maid Replacement Water Bottle Caps 2 Pack 53mm for 3 or 5 gallon jugs. Replace your old bottle cap with this BPA-free replacement bottle cap. Perfect for sealing and storing 3 or 5 gallon water bottles.