I couldn't find a file for a breather that was very accurate, so I drawed me one. I haven't printed it yet, but that will come soon. I separated the base and top for easier printing. The plain ring is designed to go inside the base in order for you to put in a hardware store screen and have that press in to hold it if you so desire. I included one with a printed screen as well as without so you have choices, because us 'Muricans like choices!