We are working on our next product, which will be a counter flashing that is designed for use with new roofs. Rather than fold the lead flashing over, these are designed to simply slide over unsealed flashing to seal the vent to the roof. It makes access to the vent by plumbers easier and less damaging because they dont have to fold the lead back to run their plumbing snakes down the vent. They also are easy to install and make the roof look good. Finally, they also have the same screening so that rats, frogs, and snakes cannot enter your plumbing and end up in your toilets or sinks.
We will be launching this soon, so keep an eye out at Critterquitter.com.