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New main vents leaking water?

GW Member Posts: 4,096
Hi guys,

We did a steam swap a few weeks ago. I noticed that one of the two main vents (#77) are coated with a rusty redidue, and water stains on the boiler right below it. The pressure is set at the minimum, and we're a good 12" from the 90 drop to the boiler return, up on a 3/4" x 6" nip/coup. I've never seen this, can the vent be bad?


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Gary Wilson
Wilson Services, Inc
Northampton, MA
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