Perfectly Fit: Our climbing ring replacement kit is compatible with Dolphin Robotic Pool Cleaners including M200, M400, M500, Nautilus, Nautilus CC Plus, DX3, DX4, DX6, Aquarius XL, Premier, and Oasis Z5i. Great Value: The package includes all four climbing rings model 6101611-R4, which are also compatible with Sigma, Triton (old), Deluxe 4/5, Apollo Plus, Wave 65, Endeavor, Edge, HD, Saturn (old), Atlantis, Apollo, 3001, 2X2, Wave 2X2, and Prowler 820/83. Premium Quality: These replacements are made from PVA material to ensure long-lasting performance. They help maintain your pool cleaner’s effectiveness and keep your pool clean. Simple Installation: Soak the climbing rings in water until they expand and soften sufficiently for installation on the rollers. Carefully slide them into place and ensure proper positioning in their designated slots.