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I got a new transfer port gasket from the interwebs. I am referring to the seal under the "brasshat" It has the brass valve and the synthetic gasket in the brass exhaust seal is totally gone now.

 I have a leaking exhaust valve on an old rear cocking plastic receiver. The synthetic seal is gone.I used a pic to scrape it all out. What can I use to replace it? Just an o-ring? Thanks!