I installed this skimmer 2 years ago. I replaced it with a smaller skimmer as it was over-kill for my set up. This is an EXCELLENT skimmer and very quiet. Comes with a spare rubber O ring for the skimmer cup

The NYOS® Quantum® 220 is an efficient and silent high performance skimmer for tanks up to 2.000 litres. Extreme performance Very smooth operation Low power consumption Easy to maintain Technical Details Pump: Quantum® 5.0 Air/Water Ratio: Optimized for maximum performance Power: 22 W Dimensions (LxWxH): 23.5 x 31 x 60.5 cm Tank Size: 500-2.000 litres Extreme performance Performance, performance and once again performance. NYOS® Quantum® is characterised by high skimming performance as a result of the large amount of air in combination with and optimum air-water mixture. Very smooth and quiet operation Aquariums should be seen and not heard. That is NYOS® Quantum® is especially silent when running and therefore can hardly be heard. Low power consumption NYOS® Quantum® is conceived to be especially energy efficient and uses a minimum of power, despite its huge performance. Easy to maintain Consistently strong skimming and simple settings are a joy. For this reason, NYOS® Quantum® is especially easy to maintain and provides the same consistent level of performance over a long period of time. Reliable pump starts are a matter of course.