Sealing ring
1
Mirro pressure cooker, ***for cookers made after 1983****for cookers made before 1983 use gasket mi-3440.
You can tell the age of your mirro by looking on the bottom - there should be a fraction such as a 3 on top and an 81 on the bottom. that means it was made in march of 1981. that will help you determine which gasket to buy.
QBPS-9882, S-9882, MI-9882, 9882