Rebecca D Peoria , AZ August 29, 2015 I own a dryer vent cleaning service and we love these little clamps for the dryer flex hose installations These are the best most cost effective way to clamp your dryer flex hose to the back of the dryer and then to the wall pipe, you will need two. No tools needed :) Read More... Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes