Broken air value Hayward ec50 filter help! Broke the top off and can’t get the screw part out to replace it. Any suggestions?

The threads probably match a standard screw thread.

I suspect that, if you went to the hardware store, you would probably be able to find a screw with the same thread.

A little teflon should make it seal. Not too tight as the plastic can crack.

Also, the part should be available at any local pool store.
 
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