Fence post cap inserts are small, removable components that are placed inside fence posts to add an additional layer of protection to the top of the fence post. These inserts typically consist of a rubber or plastic gasket that is placed inside the post cap to create a tight seal around the post, preventing water and other environmental elements from penetrating the post. They are often used in areas where there is a high likelihood of water or moisture damage. Vital Parts stocks two different style of Fence Post Cap inserts. These inserts are easy to install and remove, and can be used in both new and existing fencing projects. They are a cost-effective solution to extend the life of your fence posts, particularly in areas with harsh weather conditions or in coastal regions where the posts are exposed to salt water.