Bialetti Gaskets and Replacement Filter Plates for Stovetop Coffee Maker Bialetti Guarnizione in alluminio e filtro, 3 tazze. Bialetti genuine replacement seal and aluminium filter Suitable for the Bialetti 3 Cup Moka Express, Dama and Break models (Aluminium Espresso Makers). outer diameter 6.3cm/2.5in: Inner diameter 5.0cm/2.0in.