AO Smith pool pump leaks at the union connections near the pump inlet or outlet.

Safety First: Turn OFF power and relieve system pressure before loosening unions.

• Loosen and inspect: Unscrew the leaking union and inspect the gasket or O-ring. Replace if cracked, flattened, or missing.
• Check alignment: Ensure the plumbing lines up naturally with the pump ports without forcing. Adjust supports or piping to relieve stress.
• Inspect union nut: Look for hairline cracks in the nut. Replace the union if damaged.
• Reassemble: Hand-tighten the union and then snug slightly with a strap wrench if needed. Do not overtighten.