66 Dart GT HT Whatsitgonnabe?

I think this was leaking somewhere, there was evidence of water collecting inside the front chamber and it was rusted on the inside. Exchange of air often leads to condensation collecting and being trapped inside not-quite-hermetically sealed compartments.

I can't find any evidence of ruptured diaphragms but there was rust on pretty much all sealing surfaces. Especially on the outside where the grommet for the check valve sits. And I think the check valve is not-so-good.

Does this part come off? It looks like a bayonet coupling.