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What Is This Tapping For?

Customer is getting co reading of 200 ppm around this tapping at the top of an old american standard hot water boiler, he said it had a meter in it before they swapped from oil to gas. MassSave thought the CO was coming out of the hole, I think the top cleanouts on this boiler may need to be sealed with furnace cement, any thoughts?

Thanks, Bob Gagnon
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