Hydro-Quip 2-1/2" MBT Uni-Nut For 3" Housings w/Retainer (42-2333B-K) skimmerparts and this generic version uses

and this generic version uses the O-333 reference

Replacing a worn impeller helps improve overall system efficiency and consistent operation

Helps direct return flow in compatible systems

The 25357-700-000 is a practical service part when a compatible system needs a manifold to restore dependable internal flow distribution

Hydro-Quip 2-1/2" MBT Uni-Nut For 3" Housings w/Retainer (42-2333B-K) skimmerparts and this generic version usesThe Hydro Quip 2 1 2 inch MBT uni nut with retainer is designed for compatible 3 inch housing applications where the heater or plumbing connection needs the correct retaining hardware. A uni nut is useful because it helps secure the threaded connection in a cleaner, more serviceable way while preserving the intended fit of the supported housing. This replacement is especially useful when the original nut or retainer is cracked, stripped, or too worn