TARGET PLATE FOR A CLEAN BURN WASTE OIL FURNACE ALSO KNOWN AS AN ENERGY RETENTION DISK PART # 31232. IT HANGS BY THE EYE HOOK IN THE HEAT EXCHANGER FOR EASY INSTALLATION. IT IS MADE AT CLEAN BURN WITH A SILICA REFRACTORY MATERIAL. THIS IS THE NEWEST LIGHT WEIGHT AND YET DURABLE TARGET. THIS PART IS USED ON FURNACE MODELS: CB 1500, CB 1750, CB 2500, CB 3250, CB 3500, & CB 5000.