EZ BIO Core Pump Pre-Filter Size: 11 Single - Up to 1980 GPH Pond pre-filter using Matala media 4.3 x 7.9 inches Maximum flow allowed 1980 GPH Provide mechanical and biological filtration 1-1/2" FPT inlet or includes adapter for 1", 1-1/4", or 1-1/2" Tubing