The metal filter tube is ideal for the aquarium, to promote gas exchange and increase dissolved oxygen levels. The small mesh allows the replacement of the inlet filter of the external filter or the cascade filter. Avoid inhalation of weak shrimp. Small animals such as most freshwater shrimp, invertebrates, as well as small fish and fry are at risk of being sucked into the large slots of most standard inlet strainers. When cleaning is needed, simply brush away any debris that has collected on the filter guard with your hand or with a 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-beads, activated carbon, ceramics 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. Specifications: Material: stainless steel Size: 8.7 x 3 x 3 cm Inner diameter: 12 mm Color: silver Product quantity: 1 Package includes: 1 x filter cover