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Grundfos ALPHA1 pumps are a culmination of years of pump manufacturing experience combining the best features of Grundfos circulators into a single pump while remaining easy to operate. The ALPHA1 15-55FR is a variable speed circulator designed to provide consistent flow in a wide variety of applications. Constructed of cast iron the ALPHA1 is designed to provide year after year of reliable use. Durable Cast Iron Construction The Grundfos ALPHA1 15-55FR is crafted from cast iron which gives the pump both extended lifespan and protection against corrosion. Additional Protection The ALPHA1 features an integrated check valve to automatically prevent backflow in your system as well as nut captures for flanges. Powerful Circulation