The Model AD16,000 - Model 4.4C filtration system includes a 2" High effeciency Control Head with 2" ports in and out, with 3ea. 2" self-sealing unions included. The Model AD16,000 enters the commercial grade market of bead filtration for ponds or other aquatic habitats in the 16,000 gallon class. The Model 16,000 is used in water features ranging form very large backyard lawnscapes to fisheries, to public aquariums, and the most descriminating laboratory applications. Here also the AD16,000 far exceeds the performance of most all competitive filtration units in it's class, capable of consuming large amounts of fish waste and neutralizing equally large amounts of ammonia and nitrite from the aquatic environment. The model 16,000 will support up to 330 pounds of fish or other aquatic life in up to 16,000 gallons of water, separating and backwashing huge amounts of solid particulate waste without clogging. The Dynamax air assisted backwash makes this model extremely efficient in all ranges of waste loading. The high efficiency central diffuser column allows an effecient water flow of up to 6000 Gph (and maybe a little more) without sacrificing filtration efficiency. Be sure to read the "Fuzzy Tech" documentation for a generous amount of additional technical information regarding water flow. As with all other Aquadyne filters the 16,000 comes standard with the Dynamax air assisted backwash system.