Loose packed, genuine Bialetti replacement parts
Moka 1 Gasket: OD 2", ID 1-1/2", Thickness 1/8"
Moka 3+4 Gasket: OD 2-9/16", ID 2-5/16", Thickness 1/8"
Moka 6 Gasket: OD 2-7/8", ID 2-9/16", Thickness 1/8"
Moka 12 Gasket: OD 3-1/2"x ID 2-15/16", Thickness 1/8"
Please compare these dimensions to the one you are replacing. Some older Bialetti pots may use a different size gasket.