Zodiac - Small collar with O-ring for Nature2 Fusion - R0502400

Zodiac – Small collar with O-ring for Nature2 Fusion – R0502400

The Zodiac R0502400 is a genuine OEM replacement small collar and O-ring kit designed specifically for the Nature2 Fusion soft water sanitiser system. The small collar serves as the mechanical retention component that secures the mineral cartridge within the Nature2 Fusion housing, while the accompanying O-ring ensures a watertight seal to prevent leakage around the cartridge assembly. As a genuine Zodiac part, this kit is manufactured to the exact tolerances required for correct fitment and reliable long-term performance in the Fusion system.

The collar measures approximately 4-1/8 inches in outer diameter, making it a precise fit for the Nature2 Fusion inground installation housing. The O-ring works in conjunction with the collar to maintain a proper hydraulic seal under normal pool system operating pressures. Over time, O-rings can harden, crack, or deform due to chemical exposure and thermal cycling, leading to minor leaks or improper cartridge seating. Replacing the collar and O-ring as a matched pair ensures the integrity of the mineral sanitiser unit is fully restored.

Compatibility and installation context

This replacement kit is compatible with the Zodiac Nature2 Fusion Soft and Nature2 Fusion Inground mineral sanitiser systems. The Nature2 Fusion is a mineral-based pool sanitiser that works alongside a reduced-chlorine programme to keep pool water clean and clear. It is typically installed inline on the return line of an inground pool plumbing system. When performing routine cartridge replacement or maintenance on the Fusion unit, inspecting and replacing the small collar and O-ring is strongly recommended to avoid leaks and ensure the new cartridge seats correctly.

Suitability and buying guidance

This part is intended for pool owners and technicians maintaining a Nature2 Fusion Soft or Nature2 Fusion Inground mineral sanitiser. It is the correct replacement when the original collar shows signs of wear, cracking, or deformation, or when the O-ring has lost its elasticity and no longer provides an effective seal. Because this is a genuine Zodiac part carrying the manufacturer part number R0502400, it ensures direct compatibility and avoids the fitment uncertainties associated with aftermarket alternatives. It is not compatible with other Nature2 product lines such as the Nature2 Express or Nature2 Zodiac vessel-based systems.