DESC: Featuring New Removable Cartridge Design!Rule's new Pro-Series Cartridge Aerator Pumps feature removable motor cartridges for fast replacement?even underway. Until now, the entire pump, including its thru-hull fitting and hose, had to be removed in order to replace the pump. Rule's Pro Series pumps feature a Quick-Snap locking mechanism: just snap out the old motor and snap in the replacement. This also allows the user to fully clean the impeller area of the pump if debris accumulates. In addition, these pumps feature Rule's silent, vibrationless, and incredibly long life motors for outstanding performance and durability, and an advanced anti-airlock design that keeps the water flowing.