Sturdy: This gutter downspout extension crafted from PE material, it resists deformation under loads of at least 10 pounds rigorously tested, making it ideal for withstanding the outdoor environments. It's even tough enough to be buried underground without compromise. 2 Adapter Sizes: Each downspout extender includes two different size adapters to fit downspouts of 2" x 3", 3" x 3", and 3" x 4". The innovative split design enhances flexibility, two different sizes of adapters are suitable for all US standard downspout. Applications: Each downspout drain extension can be extended from 21" to 67". It can not only safeguards your home's foundation from rainwater damage but also assists in garden irrigating and more.