✔ For Delphin Nautilus cc plus filter. ✔ For Maytronics dolphin parts 9991432. ✔ For dolphin M400 filter M500. ✔ For Delphin M4 M5 pool cleaner. ✔ For Delphin Orion, Deluxe 3, Atlantis, Apollo, Apollo Plus, DX3, DX3s, DX4, DX4s, Sigma filter , Odyssey, Oasis Z5i. Description Parts – Ultra fine filter cartridges 9991432-R4 for Maytronics Dolphin pool robots, compatible with Delphin Nautilus CC Plus, M400 and M500. Product features : 1. Ultra Fine Filtration: Pleated filter media is used to filter all types of ultra fine debris in the swimming pool, such as fine sand, algae, leaves, etc. < p>2. Durable and durable: ABS plastic frame, more durable. When properly applied, these ultra-fine filters can last 2 to 10 years. 3 years. Product features: Dimensions: 10.43" x 6.3" Contents: Set of 4 filters for Dolphin pool robots. ; Tips: 1. Please rinse the filter every 4 weeks. 6 weeks for optimal performance. 2. Please always follow the filter user manual when changing filters.