This is Atlantic Water Garden's Satellite Skimmer - 6" Weir Door. We have a large selection of Filtration and other pond and water garden supplies from Atlantic Water Gardens.

Manufacturer's Description
Pro Series FilterFalls deliver the performance you demand and the peace of mind you deserve. In addition to massive construction and top quality components, their innovative design allows for complete customization, with three types of filter media and a bottom chamber that accepts bulkheads on all sides. Total flexibility, add-in filtration and our Lifetime Warranty equal years of trouble-free service. Application: Satellite Skimmer - Drawing and cleaning water from hard-to-reach areas of a pond, the Satellite Skimmer is used in combination with (and plumbs into) the main pond skimmer. PS3000 installs inside or outside the pond. Use with Skimmer: PS7000 / PS15000