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It is the A.I.R. manifold check valve. It lets the smog pump push air into the exhaust but keeps the exhaust gases coming out. The hole is on the smog pump side so you shouldn't be getting any exhaust gases into the engine bay. I have a used one sitting here I'll send to you for $10. PM me if interested. you could also try sanding the paint up a little and but some JB Weld over the whole.