A circulation pump keeps water moving through heating and filtration circuits when the main jet pump is not running. The Grundfos Universal Circulation Pump Kit [3-Speed] [230V] [3/4" Barb] (10-0138-KIT) is a service kit for compatible spa circulation applications requiring 230 volt power and 3/4 inch barb plumbing connections. This kit is useful when a circ pump has become noisy, seized, weak, overheated, or unable to maintain the low-flow movement needed for heating and filtration. Replacing the circulation pump with the correct voltage and plumbing configuration can restore heating performance, improve water turnover, and reduce flow-related error conditions. Universal Grundfos circulation pump kit 3-speed operation reference 230V electrical configuration 3/4 inch barb plumbing connection Helps restore heating and filtration circulation