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This collection of circulators can accommodate a wide range of head and flow requirements making them perfect for a wide range of installations. Plus because it offers 3 speeds of use this circulator is very adaptable. When changes to your installation arise like building additions a miscalculation in the building’s original system design or an added water tank or spa you can simply change the oprating speed to handle these new requirements. This Armstrong circulator uses an innovative wet roter design that provides a silent operation. It’s designed for use in closed hydronic or solar heating systems and is suitable for potable water use. This circulator requires minimal maintenance as it doesn’t require lubrication to operate. Plus it doesn’t have mechanical seals or couplers that require replacing. This model comes with a stainless steel body making it ideal for use with residential installations though it has many applications. These Armstrong stainless steel circulators also come with a removable check valve. This eliminates the need for additonal check valves in the system. Plus it can be removed when needed in replacement installations.