Apollo 4ALF-20G-03 - 10", FDA Epoxy Coated Ductile Iron, Backflow Preventer, Reduced Pressure Zone (RPZ) Assembly with OSY Gates, Lead Free

Apollo 4ALF-20C-03 - 6", Stainless Steel, Backflow Preventer, Reduced Pressure Zone (RPZ) Assembly with OSY Gates, Lead Free

Apollo 4ALF-20E-03 - 8", Stainless Steel, Backflow Preventer, Reduced Pressure Zone (RPZ) Assembly with OSY Gates, Lead Free

Apollo 4ALF-20A-03 - 4", Stainless Steel, Backflow Preventer, Reduced Pressure Zone (RPZ) Assembly with OSY Gates, Lead Free

Apollo 4ALF-200-03 - 3", Stainless Steel, Backflow Preventer, Reduced Pressure Zone (RPZ) Assembly with OSY Gates, Lead Free

A properly sized American Expansion Tank eliminates thermal expansion by giving water a place to go when thermal expansion occurs.