High Flow - optimized impeller to provide greater flow at the same amperage Built-In Thermal Cut-Off (TCO) – provides added protection for pump and vessel Back Flow Prevention - reduces the amount of water left over in the bilge, reducing odor and helping keep your bilge cleaner Hidden Air Vents in the Body – helps prevent air locking in challenging plumbing installations and helps with the check valve Threaded Discharge - easier installation, easier maintenance