It can protect the breach of sewer pipelines, waterfall pipes, drainage pipes, etc.leaves, roof moss, branches and dirt. It can also prevent rodents from entering the sewer. Very flexible, suitable for different sizes from 2 to 4 inches (rectangular and round flowers). The adjustable drainage hood is best for your drainage pipe. Made of aluminum alloy, not rust, sturdy, corrosion resistance, wear resistance, long service life, can be reused. A set of 4 weather-resistant aluminum trench protection devices.rust is suitable for round and rectangular holes from 50 to 50 mm.100mm.Dense aluminum wire can effectively prevent leaves, stones, soil, branches, etc. from falling.Block the pipe and the falling pipe.Extend the life of the pipeline.No need to clean the pipeline many times, saving time and effort.feature:It can protect the breach of sewer pipelines, waterfall pipes, drainage pipes, etc.leaves, roof moss, branches and dirt.It can also prevent rodents from entering the drain.Size and shapeare adjustable.Very flexible, suitable foràdifferent sizes from 2 to 24 inches (rectangular and round flowers).The adjustable drainage hood is best for your drainage pipe.High quality materials.Made from scratch.made of aluminum alloy, notrust-proof, robust,resistance tocorrosion,resistance towear and tear,Long lifespan, can be reused.