The Pentair Pentek DGD-2501-20 is made for the Pentair Pentek Big Blue Filter Housings and will fit into any "Big Blue" style filter housing. DGD Series Sediment Filters feature high dirt-holding capacity compared to similar size sediment filters. These filters will reduce sediment particles as small as 1 micron without imparting taste, odor, or color to your water and are chemically and bacterially resistant due to their pure polypropylene construction.