Keep Ground Dry: The gutter downpipe extension can easily extend from 20in to 59in to divert unwanted rainwater from your ground when connected to the downpipe. Flood Prevention: Enjoy cleaner lawns and courtyards, this economical downspout extension sleeve helps prevent flooding, erosion and expensive maintenance. Telescopic: This rain gutter extension pipe can be telescoped, and the length can be adjusted according to the needs, which is convenient to use. Flood Prevention: Enjoy cleaner lawns and courtyards, this economical downspout extension sleeve helps prevent flooding, erosion and expensive maintenance. Telescopic: This rain gutter extension pipe can be telescoped, and the length can be adjusted according to the needs, which is convenient to use.