Honeywell 1/2″ direct ignition dual automatic combination valve

Honeywell 1/2″ direct ignition dual automatic combination valve, 24vac, two stage, standard opening, 1.7″wc low; 3.5″wc high regulator setting, 20-200 cfh capacity, 1/2# pressure rating, 1/8″ pressure tapping with plug, for use with hot surface and direct spark systems, one 1/2″x3/8″ reducer bushing, lp conversion kit