We only carry 100% Genuine OEM Maytronics Dolphin Replacement Parts. The Maytronics Dolphin Small Fine Spring Filter Cartridge - Pack of 4 (Item 9991407-R4) is specifically designed to to fit the following Pool Cleaners:

• Dolphin Orion
• Dolphin Deluxe 3
• Dolphin Atlantis
• Dolphin Apollo
• Dolphin Apollo Plus
• Dolphin DX3
• Dolphin Dx4
• Dolphin Saturn
• Dolphin Primal
• Dolphin Neptune
• Dolphin Neptune Plus