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Posted by Russ Roth [66.220.110.35] on Thursday, June 02, 2011 at 11:15:22 :
In Reply to: Re: Tribute to the Small Big Block posted by Will (in IL) [98.215.26.138] on Sunday, May 29, 2011 at 17:17:36 :
It probably circulates water from the fire pump so it does not freeze up in the winter.
There's a valve on the pump panel you crack to direct pump water through it during freezing weather.
RR
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