Glass lined reactor manhole covers are similar to regular glass lined manhole covers, but they are designed specifically for use in glass lined reactors. Glass lined reactors are vessels used for chemical reactions that require a high degree of corrosion resistance and are often used in the pharmaceutical, chemical, and food industries.The manhole cover on a glass lined reactor provides access to the interior of the vessel for maintenance, cleaning, and product sampling. Because the contents of the reactor can be hazardous or toxic, it is important that the manhole cover is designed to provide a secure seal that prevents any leaks or spills.