The circulator is designed for a wide range of residential and light commercial higher-head circulating applications. Typical uses include hydronic heating, radiant in-floor/panel heating and closed-loop solar heating systems, and domestic water recirculation. The unique replaceable cartridge contains all of the moving parts and allows for easy service, instead of replacing the entire circulator. Compact, direct-drive, low power consumption design is ideal for high-efficiency jobs. Self lubricating - No mechanical seal - Universal flange dimensions