Product review (2 stars): Pictured hose type is fire hazard
DO NOT USE PICTURED HOSE TYPE!

I'll make this simple: You MUST use hose designed specifically as a dryer duct to ventilate your dryer.  The pictured hose (PVC) is NOT up to code to ventilate a dryer and is a fire hazard.  Lint fires happen often (any Boy Scout can tell you what a great fire-starting material dryer lint is) and your hose needs to be able to contain that brief fire, should one occur.

FYI, the pictured hose type is meant for things like bathroom fans, which is why it's sold.