Cirkul Alternative Replacement Cap

Tired of all the flavors? Just want to drink plain water? Run out of pricey flavor cartridges and still want to use the expensive water bottle you purchased? The Cirkul Alternative Replacement Cap to the rescue! Use this cap in place of the flavor cartridge to give your water bottle new life. Use in conjunction with a #34 o-ring with an outer diameter of 1 ½ inch, an inner diameter of 1 ¼ inch, and a thickness of 1/8 of an inch. (38.1mm x 31.75mm x 3.175mm give or take…) This will make the lid actually leak-proof.