Waterway In-Ground Gunite Skimmmer Complete [2 Port] [2-1/2" Spigot] (540-6410) pleatco and FC-9840 reference give this

and FC-9840 reference give this part practical value because DE components work best when the replacement matches the original grid layout and connection style closely

Therm heater tailpiece with 3 inch MBT by 2 inch slip connection

Helps improve long-term sealing performance

Helps support over-temperature monitoring

Waterway In-Ground Gunite Skimmmer Complete [2 Port] [2-1/2" Spigot] (540-6410) pleatco and FC-9840 reference give thisThe Waterway 540 6410 in ground gunite skimmer is a complete assembly designed for compatible 2 port installations and features a 2 1 2 inch spigot connection. A complete skimmer like this is useful because it restores the full skimming assembly in one replacement, making it a practical solution when the original housing and related components need broader renewal rather than piecemeal repair. Gunite skimmer assemblies need to match the original