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This is just the bulkhead fitting with 1/2 screen, nut, and O-ring. The Fill/Drain Fitting Kit includes one fill/drain fitting (custom bulkhead fitting with 1/2 screen, nut and O-ring) and one overflow fitting (PVC tube and adapter with 1 screen). These work great individually, but work together to allow you to make a tray into an ebb/flow system.