Bialetti Replacement Rubber Seal for 2 Cup Brikka Espresso Maker bialetti original replacement rubber seal/ring/gasket suitable for the 2 cup brikka aluminium espresso makers outer diameter approximately 6.6cm/2.6in - inner diameter 4.8cm/1.9in. loose packed. cup size is based on espresso cup sizes and not on regular tea or coffee cup sizes.