It couldn't be more versatile: Combination adapter for use with almost all standard nozzle sizes, with or without a rim. With our practical adapters, you can change the nozzle when the piping bag is full and continue decorating immediately with the other nozzle. Insert the inner nozzle into the piping bag. Place the nozzle on the inner piece and secure with the locking screw. The nozzle is absolutely tight. The piping bag can now be filled.