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...(click on product image for more details)