Functionality: The trumpet water valve is a device installed on musical instruments to expel condensation water. It is a small valve typically located on the main pipe of the instrument. Application: When drainage is needed, the player can press the valve, and water will be discharged. This drain valve is crucial for maintaining the normal operations of the instrument as it prevents condensation from accumulating and causing damage. Quality Material: Made from quality Metal and Wood , this Trumpet Water Key Valve kit is sturdy, waterproof, and strong. Repair Replacement: This Wind Instruments Accessory set can be used to repair or replace damaged or old water key spray valves. Package Contents: Each package includes 2 Water valves, 2 Water keys, and 2 corks. Specification: Material: Metal and Wood Size Chart:Water Valve Length 4.4cm/1.73inch Package Includes: 2 Trumpet Water valves 2 Trumpet Water keys 2 corks Note: Please allow slightly errors due to manual measurement and different monitors.