Smart Valve, Gas Flow Control and Electronic Intermittent Pilot Sequencing , 24Vac, 90 Second Ignition Trial Time, Continuous Retry, 1/2 Psi Pressure Rating, 1/8" Pressure Tapping, Natural Gas, Slow Opening, 1/2"x1/2" NPT, 3.2" wc , 0-175 Degree Ambient Temperature Range, 15 Second PrePurge