Honeywell 1/2×3/4″ 24vac standing pilot dual automatic combination valve

Honeywell 1/2×3/4″ 24vac standing pilot dual automatic combination valve, 3.5″ water column, standard opening, single stage, 30000 btu to 290000 btu max, 1/2# pressure rating, 1/8″ npt pressure tap with plug, includes 3/4×1/2″reducer bushings (1), includes natural to lp conversion kit , 3/4″ straight flange, eco adapter, q340 thermocouple with adapters