Royal Exclusiv Bubble-King Skimmers These skimmers are totally different from all other skimmers. The facts in detail: Diameter: from 200 mm to 650 mm All tubes made of “GS-Plexiglasrohr” (Acrylic) with a thickness from 4- 6 mm Oxygen partition plate on the bottom - injection pan with conical counter bored holes for clear turbulence reduction. Skimmer flotate cup with one hand solvable, because of CNC-lathed screw connection and 2.5 mm silicone seal, therefore it is totally sealed and salt creep free. The height to screw it out is Only 20 mm. Integrated discharge adjustment for perfect water adjustment inside the skimmer. With original Red-Dragon ® pump with standard anti-lime bypass and titan screws. With nozzle and acoustic waves uncoupling system. - Super Quiet - only 46 db, and is hardly audibly. Low maintenance because the nozzle is only attached. Energy Efficient: 38-78 watt. Turnover approx. 3000- 10.000 l/h Air suction min. 1000 - 3.000 l/h Height: 65cm All construction dimensions from 55 to 90 cm are possible. Suitable for reef-tanks to 10,000 + liters