Reef Octopus Classic 150-INT Protein SkimmerClassic 150INT In Sump Protein Skimmer A member of the Reef Octopus Classic Series, this popular in sump skimmer will provide great filtration for marine aquariums up to 210 gallons. As with every Reef Octopus protein skimmer, the Classic 150INT is constructed of high quality cast acrylic and features an easy to adjust gate valve, a quick release neck for easy cup removal, cup drain, bubble diffuser, o ring sealed union pump mount, air