Where to find EPDM gaskets
 

Just wondering if anyone out there knows of a source that I could order an EPDM gasket or two from. I'm looking for one to replace the stock one that came with my waste collector for my protein skimmer so that it seals airtight. The current gasket lets air seep through so I'm thinking a thicker one should do the trick. Its for the 5L Aqua C model so the gasket is in the range of 6" ID. Thanks.

Maybe an o-ring will work.