Maytronics Dolphin Spring Cartridge Filter Panel [Qty 4] (9991433 ASSY) lighting Designed for compatible Raypak heater Designed for compatible Raypak heater service applications using part number 004428F Flow meters are useful because they make it easier to confirm that circulation or feed conditions are where they should be during normal operation or service checks This set has practical value because replacing all four panels together can help maintain more even filtration performance than mixing old and new cartridge panels these filter panels help support dependable debris capture and better overall robotic cleaning performance