JoyKeys function automatically and have no moving parts. The JoyKey case is made of solid nickel silver. The water rings and screw caps are interchangeable. Once installed, you can forget about the JoyKeys on your instrument except for when a WaterWick needs to be replaced. JoyKeys automatically drop the water out of your instrument whilst you are playing, allowing you to maintain a constant "Flow State." Placing your instrument in/on an appropriate stand when resting facilitates the process of keeping your instrument water free.
At first you might feel a little like someone who has just given up smoking and is wondering what to do with their restless hands. Within a week or two you'll probably find it hard to remember what it was like to have to pull slides all the time, grab for a water key lever or get upset at having clammed a note or entry because there was water in the lead pipe. You'll quickly learn to value the peace of mind you have to prepare for your next entry.
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I am a repair person in the Baltimore/DC/NOVA area. I have had several customers request these, and have subsequently installed them on my own horns. I find them to be highly effective. There are no moving parts and they will work as advertised providing you clean the filter element regularly. One Joy Key on the leadpipe has allowed me to play entire movements of quintet literature without once stopping to empty the water.
I soldered the Joykey onto my cornet using the existing water key hole in the leadpipe. I am extremely happy with how this thing works! It has not effected the sound or playability at all. I honestly don't know how I tolerated the traditional water key emptying process, since it used to break my concentration during practice. I no longer have to use the third slide water key. The only con is that the water drips every minute or so, but It's slow enough that it evaporates before it has a chance to form a wet spot or puddle (the air is dry at present). I might eventually fashion a bit of sponge or cloth under a leather wrap or something. I highly recommend this gadget!