A pre-filter housing is a component used in filtration systems to house and protect the pre-filters, which are responsible for removing larger particles, sediments, and debris from liquids or gases before they reach finer filters or the system's main processing units. These housings are typically made from durable materials such as stainless steel or plastic and are designed to be easy to replace or clean. They help extend the life of more delicate filters and improve the overall efficiency of the filtration system.