For equipment that is still worth keeping in service, Pentair IntelliFloXF 2-1/2" Black Union Nut (411000Z) helps address the worn component instead of replacing the larger assembly. This hardware helps secure the assembly with the proper fit and thread engagement for the specified equipment. It is especially useful for plumbing connections where unions provide a secure seal while still allowing future service access.. Supports compatible Pentair equipment service Helps restore fit, function, or system reliability Useful for repairs, rebuilds, and preventive maintenance Confirm the model, voltage, plumbing size, horsepower, or system generation before ordering. Matching the 411000Z part number helps reduce installation issues and keeps the repair focused on the component that actually needs attention.