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How to install a new circulator pump, Spread your tools out in a safe place so that you can see everything. Also take the new circulator pump, flanges, gaskets and bolts out of the boxes and bags they came packaged in. Now that you have your tools ready you will want to isolate where the pump is being installed. What this means is that you will want to “valve off” the area. If you are just replacing a circulator then you should have isolation valves on each side of the flange. If this is a brand new install it might require you to shut down a system or a line that is being feed by a main. That you can only determine because you are the one installing the pump. Basically make sure the line is NOT live before removing the pump or cutting the pipe.