Here is a picture of Critter Quitters available at the Winter Garden ACE located a 500 S Dillard St. They have a nice video playing that explains how they work. If you live in the area this is where to go to get them
"Thank you for your follow-up. I have installed the smaller ones (my first order), but have not installed the larger one yet. While the angle was appropriate for the pitch of my roof, the pieces were too long which required that I cut them down a few inches. This proved a bit awkward with the limited tools I had on hand, but was not a major concern. The larger one is going to have to be cut down as well, but I'm sure I will figure it out as well. I am quite impressed with the product, as it seems to address the exact need (as long as those pesky varmints don't eat it too). Thank you for a well-designed, well-made, reasonably priced solution to such a common problem.
Surprisingly, most people I have spoken to do not know of this problem--or your great solution. I will do what I can to correct that! "
R POrlando, FL
"I installed three of he Avalon Critter Quitters® about three weeks ago. The installation was easy and I only needed to cut the base of one of the three Critter Quitters® that I purchased. The screws hold the Critter Quitters® tightly in place. and it was very easy to position it upright. A little of the history of my problem. While cleaning leaves off my roof, I was surprised about two months ago when I noticed that the lead-covered PVC vent pipes were being consumed (chewed) by squirrels. I never knew that this was a problem until I looked at nearby houses and saw that they too were severely damaged. It was easy to see that eventually the rain water entering the space between the lead pipe and the PVC would accumulate and cause wood rot in the roof. My roof is only 5 years old. :-( However, the fact that these "rats with furry tails" could consume such a large amount of lead was surprising. I quickly became better educated when I did a Google search and troubled to learn that this is a major problem. One option was to use copper piping to cover the PVC (instead of lead). The installed copper pipe didn't look very well in the photos. I suspect the replacement from lead to copper would be quite expensive. I then came across your website. Your Critter Quitters® is well designed and constructed. I especially like how the rain water coming into the top of the Critter Quitters® is directed back into the vent pipe and not into the space between the remaining lead pipe and the PCV. Let me end by again saying thank you for providing such a great and useful product. Its a big success. I don't typically write endorsements like this but your product is that good! When you start fully advertising the Critter Quitters® and the widespread problem that it fixes, you won't be able to keep it on the shelves!"