Functionality: 1. Good Compatibility: The ultra-fine replacement cartridge filter plates are perfectly compatible for CC Plus, for M400, for M500 2. Premium Material: ABS plastic frame is stronger and more durable. The part number is 9991432 R4. A good modification part for pool cleaners. 3. Effective Filtering: This pool cleaner filter removes pool dirt and debris such as leaves, hair, dust and diatoms etc. 4. Keeps your pool clean: The replacement filters for the robot pool cleaner keep your pool spotless and ensure that your pool stays optimally clean. 5. Lifespan: The premium ultra-fine filter lasts 2-3 years. Please rinse the filter every 4-6 weeks for optimal performance. Specification: < p> Item Type: Pool Cleaner Robot Filter Material: ABS Weight: Approx. 355g / 12.5oz