Apr 17, 2020 · Splash blocks are rectangular pieces of plastic or concrete placed underneath the end of the downspout. Their purpose is to direct water as far away from your home as possible while preventing the soil from erod causing foundation issues. The width of splash blocks depends on the frequency and severity of rainfall in your area.Frost King DE300 Standard Plastic Drain Away Downspout Extender, Extends 12', Green. 3.3 out of 5 stars 1,483. ... Flex-A-Spout 55" Downspout Extension, Stone. ... Flex-Drain ADP53102 Downspout Adaptor, Landscaping D. 4.1 out of 5 stars 31. $16.55 $ 16. 55. Get it by Tuesday, ...The manner a downspout extensions is designed and built, as well as the material used, determine its durability. Select the downspout extensions that can tolerate wear, pressure, and damage. Also, make sure it has a streamlined style that fits everywhere. A busy mom or a construction worker will appreciate this product’s durability.Downspout extensions pvc vinyl flex-a-spout white Flexible tube easily attaches to the downspoutuded). Can be bent into the desired water flow direction, or can be buried out ofes downspouts.