These are replacement internal valve gaskets for the bottom dump valve on your Blichmann tri-clamp Fermenator. 1" in size, these are the correct gaskets to replace those found on the tr-clamp bottom dump valve on the tri-clamp fermenator. Over time, these gaskets may wear or become damaged. Rather than risking leaking or contamination of your beer or wine, get new ones from us! When it is time to replace these, we will have them for you.