The Astral Pool outlet union nut is designed for compatible 2 inch FBT outlet applications where a serviceable plumbing connection needs secure fastening. A union nut is useful because it helps clamp the union assembly together while still allowing the connection to be disassembled later for service.This replacement is especially useful when the original nut is cracked, stripped, cross-threaded, or missing. Using the correct union nut helps restore the proper hold at the outlet connection and supports a cleaner, more dependable plumbing finish.The 00611R0002 is a practical hardware replacement for compatible Astral Pool systems that need renewed outlet-union fastening and serviceable connection support. Astral Pool outlet union nut Designed for compatible 2 inch FBT outlet applications Helps secure serviceable union connections Useful when the original nut is cracked or stripped Supports cleaner and more dependable plumbing retention