This is the ones I have and the rubber isn’t sealing anymore. I have about then bottles I could start using again if I can find replacement pieces. I tried to buy some complete tops online, but they don’t fit properly. Anybody know where I can buy the correct top or the rubber mouth piece?
Any specialized cap will do the job. Looks like you have moflo abd fwiw I’m not a huge fan of the new version. Half closes very easily which makes fast drinks or squirting into bta hard to do