Reliance 400 series, 2 inch shank, electronic natural gas control valve, 4 in. 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.
