I purchased this new and opened the package, but it has been stored unused, so it is almost new. It is said to remove dirt that cannot be removed with ordinary swabs or brushes. It fits the LIXIL shower in my home. J. Meinlschmidt Hydro Jet. For trumpet, horn, and euphonium. ■ Hydro Jet ■ For internal cleaning of brass instruments ■ Compatible with trumpet, flugelhorn, cornet, horn, tenor horn, baritone, euphonium, etc. ■ Attaches to a shower hose (1/2" thread) for use ■ Length: 1.5m [Comments from the sales site] This is an excellent product that can remove dirt inside the instrument with powerful water pressure! You can easily clean it by simply replacing your shower head in the bathroom. The water pressure is stronger than you might expect, but it's easy to adjust the water pressure since you're using the shower in the bathroom. If you're worried about damaging the inside of the instrument, you can make it clean enough by adjusting it a little weaker. Also, for those who don't want to get the bathroom dirty, we recommend the dedicated attachment that can be attached to a gardening hose (search for Hydro Fit). It would be great to clean it in the garden on a sunny day.