Zodiac - Union joint kit (2 pcs) - R0728800

Zodiac – Union joint kit (2 pcs) – R0728800

The Zodiac R0728800 is a genuine replacement union joint kit containing two union joint assemblies designed for use with Zodiac FHP series pool heat pumps. Union joints are the critical hydraulic connection points between the heat pump unit and the pool’s plumbing circuit, allowing water to flow through the heat exchanger efficiently while also enabling the unit to be disconnected cleanly from the pipework for maintenance or servicing without disturbing the surrounding plumbing. This kit provides both unions as a matched pair, ensuring a balanced and leak-free installation on both the inlet and outlet connections of the heat pump.

As an official Zodiac spare part, this kit is manufactured to the exact tolerances and specifications of the original components fitted during production. The union joint design allows the heat pump to be isolated and removed from the hydraulic circuit quickly and cleanly, reducing service time and avoiding the need to drain or cut pipework. The two-piece kit ensures both connection points are renewed simultaneously, which is recommended practice when replacing worn or damaged unions to maintain uniform sealing performance across the full hydraulic circuit.

Compatibility and technical context

The R0728800 union joint kit is confirmed compatible with Zodiac FHP 50M and FHP 75M heat pump models, as referenced in official Zodiac and Fluidra catalogue documentation. These are electric inverter-driven pool heat pumps intended for residential swimming pool installations. If you are unsure whether this part fits your specific heat pump model, cross-reference the part number against your unit’s spare parts diagram or consult the technical documentation supplied with your FHP heat pump.

Union joints in pool heat pump systems are subject to ongoing exposure to pool water chemistry, UV radiation, and thermal cycling. Over time, the sealing surfaces and locking ring mechanisms can degrade, leading to minor weeping or leaks at the connection point. Replacing the unions at the first sign of deterioration prevents water ingress near electrical components and maintains the operational integrity of the heating system. Installing a matched pair from this kit ensures consistent thread engagement and sealing performance on both sides of the heat pump.

Suitability and buying guidance

This part is intended for pool owners and installers working with Zodiac FHP series heat pumps, specifically the FHP 50M and FHP 75M models. It is a direct OEM replacement part sourced from Fluidra/Zodiac and is the recommended replacement whenever union joints show signs of leakage, cracking, discolouration, or difficulty engaging the locking ring. Because this kit contains two unions, it covers a complete replacement of both hydraulic connections in a single purchase, making it the most practical and cost-efficient option for a full service intervention. Professional installation is recommended to ensure correct torque and sealing on reassembly.