Quantity: 2 piecesSize: Suitable for 12mm outer diameter water pipe: inner diameter 12mm, outer diameter 25mm, height 68mm. Suitable for 16mm outer diameter water pipe: inner diameter 16mm, outer diameter 30mm, height 85mm.Product features: Suitable for all kinds of external filters and waterfall filters with an outer diameter of about 12mm or 16mm in the inlet pipe. Protects and prevents small fish and shrimp from being sucked into the filter and causing their death. Prevent large pieces of waste and aquatic plants from being sucked into the filter. Shrimp Protection Filter: The stainless steel basket prevents shrimp and fry from being sucked into the filter. High Quality: Made of high quality stainless steel, non-toxic, environmentally friendly, strong, durable and long service life. Mesh: The mesh is so small that small shrimp and fish will not be sucked into the filter. Easy to Clean: For cleaning, simply brush the accumulated dirt on the filter cover with your hand or a soft brush such as a toothbrush. Multi-Purpose: Ideal for tropical fish farms, koi ponds, sewage systems, cooling towers and other commercial and industrial systems. Precautions: 1. Please wash the protective cover frequently to prevent waste from clogging the water inlet. 2. When cleaning, pay attention to the weld joints of the steel wire.3. The steel mesh may be deformed during transportation, but you can press and pinch it to gradually restore the shape.