In many areas of the United States plumbing vents are sealed with lead. Unfortunately, squirrels like to gnaw on the lead and tear it open, potentially causing roof leaks. Over time, these leaks can cause significant damage. In addition plumbing vents are a major entry point for frogs, rats and other animals to enter into toilets. In the past the only way to repair this was to call a contractor, have them pull shingles, replace the lead and put a screen on the repaired vent. A repair that requires shingle removal rarely looks good potentially exposes damage and is expensive. Critter Quitter offers a cost effective and attractive solution to this problem. A home owner can repair their damaged plumbing vents without having to remove shingles or call a professional. Simply cut the unit to match your roof pitch, slide the unit onto the damaged vent and secure with 4 stainless steel screws (provided). The internal component will direct rain water into the vent keeping the damaged portion dry and keep animals out of plumbing. The unit is easily removed if plumbing vent access is required. Size: large. Material: Plastic.