Quote from techybrain on October 7, 2024, 7:53 am

The two drain plugs on the Homelite UV80522 boosts performance by draining water down to manageable depths in the lower and upper parts of the pump housing. This feature inhibits the accumulation of water that produces rust and which makes it to expand during freezing conditions. Good drainage also discourages the forming of sediments which may clog the pump and result to a decline in efficiency. In this way, Shower Drains are assured of longer operational run that is free of hitches due to the dual-drain system that encourages proper maintenance, leading to the pump’s longevity even in changed conditions.

More information: https://techybrain.net/why-are-there-two-drain-plugs-on-homelite-uv80522/