The Taco 008 Stainless Steel circulator can be used in higher-head heat recovery, water source heat pump,open-loop solar heat and domestic water recirculation systems. 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