Flange covers are protective covers that are used to protect flanges from damage or contamination during transportation, storage, or installation. They are designed to fit over the flanges and can be made from a variety of materials including plastic, rubber, or metal. Flange covers are available in a range of sizes and types to fit different flange configurations and applications. Some common types include bolt-hole covers, full face covers, and ring type covers. Flange covers help to ensure that the flanges remain clean, corrosion-free, and protected during shipping and handling until they are ready for use.