ion5555ACi Deluxe Sump Pump Battery Backup Dual Pump Battery Backup AC System. Two 12 HP sump pumps with stainless steel and cast iron construction. Engineered for primaryParent Nuclides. Direct parent isotope is: 55 Co. Formation. 55 Fe can be artificially produced by neutron irradiation of stable iron isotopes: 54 Fe(n,γ) 55 Fe or 56 Fe(n,2n) 55 Fe. Accordingly, iron-containing components such as steel