Johnson Pump Mayfair Aerating System Intake Filter. Holding bracket is mounted on the thru-hull nut. Drilling of holes is not required. Unit can be removed for cleaning with easy twist lock action. Quick release. Features of Johnson Pump 77125 Mayfair Aerating System Intake Filter Filters foreign particles that can clog aerating pumps and systems Holding bracket is mounted on the thru-hull nut so drilling of holes is not required Quick release mechanism for easy cleaning Versatile and dependable to fit your boat's needs Package Contents: Johnson Pump 77125 Mayfair Aerating System Intake Filter Johnson Pump 77125: Mayfair Aerating System Intake Filter