This is a replacement high temperature silicone O ring for the BrewKettle KettleValve. Replaces the O ring on your R45 KettleValve as well as on the Brewer's Edge BrewKetttles. It also fits the Zymico Weld-B-Gone stainless bulkhead and valve (it is 1 1/8" in outer diameter) as well as our S04 Stainless Backnut. These last for years and generally do not have to be replaced unless damaged. Sold individually.