http://www.ziphinge.ca/
John Whyte, the President of Zip Hinge Canada, talks about downspout extensions. Your downspout extension should actually be 3 feet long to properly divert water away from your foundation, depending on the grading of the property.
The Zip Hinge is a tough reliable downpipe extension hinge made of durable aluminum. The Zip Hinge serves two main purposes:
1- Ensures that the downpipe extension remains attached to the downpipe to protect your home's foundation.
2- Provides convenience for moving and working around the downpipe extension (mowing, landscaping, etc...)
