For repair of Hose (No. 9-21-049-GN1) and for replacing Vacuum End Sleeve (11/4") (No. 9-21-047-K13) whenconnecting two Hoses (No. 9-21-049-GN1) together. Requires Threaded Ring (11/4") (No. 9-19-067-K13) and Snap Ring (11/4") (No. 9-19-066-A13).