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Posted by jtown on November 11, 2003 at 21:01:37:
In Reply to: What is this on my boiler? Flow control? posted by JOE on November 11, 2003 at 19:47:38:
Flow control has a weighted disk to prevent flow while you make hot water in the summer. Turning the handle lifts the disk (normally done by pump pressure) during power outages. Hopefully the system is laid out with size and pitch for good flow.