The Saturn waterkey is a unique device that employs a ring trigger for the valve. The player presses the ring from any direction using either hand. Doing so dislodges a stainless steel helical sprung ball from an airtight seating. Release the ring causesthe stainless steel ball to return to its seating and once again make an air-tight seal. For use on trumpet, horn, euphonium, tuba or bari sax. Optional use on trombone (for those of longer arms). Installation by a qualified repair technician is required. Note: Ring portion on current models is black.