My Reef Creations commercial line of Protein Skimmers are the best in the industry. All Commercial skimmers are built with 3/8" cell cast sheet on the skimmer box for durability. Revolutionary 4 Beckett design Quite possibly the first 4 beckett protein skimmer in the world! 4 Beckett's with a twist! Each Skimmer can run with 2, 3 or 4 Beckett's with the turn of a ball valve. This allows for cleaning of the units injectors without turning off the skimmer! All are over built to handle the rigors of Commercial abuse!