The Cap-Drain Hose, drain pump filter drain hose plug 5006EN3015A, is an essential component of LG washing machines. It's a small, removable plug that attaches to the drain pump filter hose. This hose, located near the bottom of the washing machine, provides access to the drain pump filter for cleaning. The cap-drain hose serves two important functions. First, it seals the hose opening to prevent water leaks from the drain pump filter hose during normal washing machine operation. Second, it's removable, so you can easily drain any residual water from the hose while cleaning or maintaining the drain pump filter. A properly functioning cap-drain hose is essential to prevent leaks and ensure the LG washing machine.