snippet: <b>Maxitrol M511B-1/2 Selectra Modulating Valve 1/2" (Vent Tap on Both Sides)</B><br>Maintaining consistent temperatures is no longer a problem. The unique Modulator or Modulator / Regulator valve, the heart of the Selectra Electronic Gas Flame Modulating System, provides precise, non-fluctuating, instantaneous temperature control without requiring any motor or mechanically driven butterfly valve.

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