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Drain valve for Radient system, How to open

Posted by Francis O'Hara, on Thu 05 Dec 2019 07:32pm

I have a drain valve on the manifold of my residential boiler system, that is a mystery to me. It should be a drain valve, but I am mystified how to open it. I can provide a picture of it. I am attempted to get the air out the main system.

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