The 4" Female Adapter x End-Plug Type Dust Plug - Brass is a robust brass fitting designed to connect 4-inch male-threaded pipes with female-threaded components. Featuring an end-plug dust plug design, it securely seals the open end of a pipe or fitting, preventing dirt, dust, and contaminants from entering when the system is inactive. Made from durable brass, this fitting offers excellent corrosion resistance and a leak-proof closure, making it ideal for use in plumbing, industrial, and pneumatic applications that require reliable protection and sealing.