O-rings are used to make air and vacuum-tight seals between the two halves of an O-ring glassware joint. For more on such connections, see the Joints Page of our Glassware Gallery.
We currently carry Viton® O-rings with inner diameters from 2.9 to 145.4 mm. Click below to learn more and select a size. Ethylene-polypropylene O-rings are available upon request.