Where can you buy a sealing ring for a marke tischfein pressure cooker?

There is a site wmf. I saw gaskets for all marke tischfein pressure cookers just yesterday june 17, 2012. google wmf and marke tischfein and it will take you to all these sites that have some of what you are looking for. Marke tishcfein, from my experience, was or is like neman marcus. They ain't cheap. I hope this helps.