In plumbing applications, this 2-inch copper fitting brush effectively cleans and prepares fittings for secure connections. It features crimped carbon steel bristles that provide durability and efficient cleaning action. With an inner diameter of 2 inches and an outer diameter of 2-1/8 inches, it is designed to fit snugly into copper fittings. The heavy gauge galvanized stem wire adds to its strength and longevity, making it a reliable tool for maintaining plumbing systems.