No one likes a leaky brew kettle! The BoilerMaker line of brew kettles from Blichmann Engineering contain a number of o-rings to seal in all the high-tech components. Over time, these can wear, and excessively rough cleaning techniques can cause them to break or (more commonly) get lost. Never put off brewing due to a lost or broken o-ring again! This kit comes with all the replacement o-rings you need for a BoilerMaker brew kettle, including external seals for the three-piece ball valve, sight glass and Brewmometer. Very handy to have on hand in case of a brew day emergency!