Reliance 400 series, 2 inch shank, electronic natural gas control valve, 4″ w.c. (water column), thermostat powered by 750 millivolt generator, noticeable L-E-D indicator light blinks 1 time at 3 second intervals during normal operation, increased temperature control and accuracy, integral spark igniter, fits reliance standard 400 natural gas water heaters with electronic thermostat control.

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• • Use only on original manufactured/factory reliance heaters
• • Installed electronic gas control valve
• • Blinking L.E.D light