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Can I convert a Taco 007 to a Taco 007-IFC?
My system has three Taco 007-IFC circulators and one Taco 007. When my old heating system was replaced, I rescued a nearly new Taco 007. Now the odds are that an IFC model will be the one that quits. So can I just get a new plastic gizmo with a spring (the IFC part) and stick it into the existing 007? Or is it machined differently?