Honeywell SmartValve, 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, Step Opening, 3/4″x3/4″ NPT, Full Rate 3.5″ wc, Step Setting 0.7″wc, -40-175 Degree Ambient Temperature Range, 30 Second PrePurge