The metal filter tube is ideal for the aquarium, to promote gas exchange and increase dissolved oxygen levels. Small mesh allows replacement of the outer filter inlet filter or waterfall filter. Avoid inhalation of weak shrimp. Small animals such as most freshwater shrimp, invertebrates, as well as small fish and fingerlings are at risk of being sucked into the large slots of most standard intake strainers. When cleaning is needed, simply brush the debris that has accumulated on the filter guard with your hand or with any soft brush, such as a toothbrush. Ideal for tropical fish farms, koi ponds, sewage systems, cooling towers and other commercial and industrial systems. Features: Good choice for your aquarium percolator. Ideal for bio-balls, activated carbon, ce ramic and ammonia remover. Traps particles and debris, improves biological filtration, prevents small inhabitants and babies from being drawn into the filter. These intake strainer covers slide easily over the intake tube and keep fish out of it. Features: Material: stainless steel Size: 8.7x3x3cm Inner diameter: 12 mm Color: silver Product quantity: 1 Package includes: 1x filter guard