Cap and Ball Assembly found in regulator kit 13142 goes with the CB 500, 525, 525S, 525S2, 550, 550-S2, 551-H3, 551-H5, A2, CB 100 and 125 burners. It is Clean Burn part # 32364 and it replaces part # 32228 which may be in some of the older furnace manuals.