I ordered 4 of these as we have the 80 lb feed silo and we have it positioned in the corner of our run. While the design of the silo mostly keeps water out of the open ports, we did get a little rain in a couple of the open ports after a particularly windy storm so we ordered the covers as extra protection for the ones facing the outside of our run. The covers are snug and fit PERFECTLY, they aren't loose in any way but are easy to install and remove, as necessary.