SPX Flow - Johnson Pump Cartridge Livewell Aerator Pump Compact Johnson Pump Cartridge pumps have a smaller profile to fit in more confined spaces. These Johnson Cartridge Livewell Pumps feature internal anti-airlock feature to ensure an even flow of water to livewell. This fully submersible 12 volt pump is easy to install and clean. The Johnson Pump Cartridge Livewell Pump is a direct replacement for Mayfair Cartridge Livewell Pumps and is compatible with Mayfair Replacement Cartridge Motors. F