CMP 25563-052-000 Back-Up ValveRestore Proper Movement and Coverage to Your Pressure Side Pool Cleaner The CMP Back Up Valve for Automatic Pool Cleaners (25563 052 000) is a critical mechanical component designed to regulate reverse movement in pressure side pool cleaners. By periodically redirecting water flow, the back up valve prevents the cleaner from getting stuck, tangled, or trapped in cornersensuring full pool coverage and consistent cleaning performance. This CMP back up