Cad Lights TIA-1220 Conic Protein Skimmer for Aquariums, 250-Gallon Air intake/silencer is fully adjustable by 360 degree turns for easy access; extra clearance allowing restricted air intake and even ozone inlet Flexi-Plastic injection molded pin-wheel impellers for extended life and designed for high volume air draw Mold-Casted Acrylic body; Solid seamless with no joints Extra thick Acrylic construction Lock-tite pressure control system features fully sealed drain pipe for consistent pressure that stabilizes fluctuations within the reaction chamber Dimensions: 1275" x 9" x 20"