E-Guardian M12 Yearly Maintenance Kit Includes: Every gasket and o-ring needed to reassemble any M-II (E-guardian) series heater. Also includes both glow pin screens, fuel pump filter screen, blower o-ring, burner gasket. Product Specifications: Any M-II (E-guardian) series hydronic heater. Model Specific: Hydronic M8: 25 2470 - 12 Volt / 25 2471 - 24 Volt Hydronic M10: 25 2434 - 12 Volt / 25 2435 - 24 Volt Hydronic M12: 25 2472 - 12 Volt / 25 2473 - 24 Volt