Everything you need to upgrade to UltraFilters. This includes the base and 4 UltraFilters.

• Convert your Dolphin pool cleaner from a bag filter to a cartridge filter
• Compatible with: Nautilus Pool Up, Supreme M3, Endeavor, Apollo, Primal, DX3S, DX4s, Neptune, Neptune Plus, Atlantis, H50
• Maytronics Certified Genuine Parts; Keep your Dolphin pool cleaner in top condition