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I ordered mine off amazon for about 20 bucks shipped. In case anyone doesn't have a napa near by or likes online shopping like me.
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The silver disc.

Maybe I can do it in car.. I pulled it during the rebuild and just had that in my head. Thank you. I'll try it out.

Oops.. I put mine back in. Is it worth the effort of pulling the tank just for that? What's happens when it fails?