SOURCE: Starbucks Estro Barista Athena
Mine is a red O-ring about 2 1/4" diameter, the same as some automotive brake calipers. A well equipped mechanic or parts store like NAPA should have a supply of O-rings with the proper size, best to take your strainer in to test fit.
SOURCE: I have a starbucks barista athena that has a vapor
It's easy to break the vaporlock on an Athena.
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