This direct-replacement heat sleeve is designed to fit PPE down pipes #117000400 and #117000424. Made from 100% pure lava rock fiber, it provides durable, high-temperature protection - perfect for restoring the original thermal shielding on your down pipe. With continuous temperature resistance up to 1650F and reliable long-term performance between 1300F and 1650F, this sleeve helps manage radiant heat and protect surrounding components.