Reliance 400 Series 2" Shank Resideo Gas Control Valve. It is foam insulated and requires a longer shank. The thermostat is powered by a 750 millivolt generator and has a noticeable LED indicator light that blinks 1 time at 3 second intervals during normal operation. This valve provides increased temperature control and accuracy and has an integral spark igniter. It fits Reliance Standard 400 Natural Gas Water Heaters with Resideo Control. Comes boxed.
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