Our Deluxe Reef Sumps are loaded with features and accessories. They are a fantastic, affordable solution for aquarium filtration. With strong construction, our sumps are built to last. The silent spill-over filter sock location eliminates salt spray and makes changing your filter sock a snap. The unique bulkhead hole cover gives you the flexibility to put a heater, or other device, in the spill-over location. This will keep it safe and out of the way. And the adjustable baffle will help you maximize skimmer performance.