Water key cork for trombone, cornet, speakers and similar instruments. A practical, easy to install cork stopper that replaces worn water key corks and helps keep water keys functioning reliably. Key benefits Restores water key sealing and drainage function, reducing unwanted leakage during play. Durable cork construction with fine workmanship resists wear for long service life. Lightweight and portable, suitable as an onthego spare for rehearsals and performances. Simple to with a reasonable design and good water absorption capacity. Important attributes Function: water key cork stopper for brass instruments and compatible devices. Compatibility: designed for use with trombone and cornet water keys and other similar applications. Material: cork, chosen for natural compressibility and absorption. Performance: reliable sealing, good water absorption, and easy replacement for routine maintenance. Practical use scenarios a worn cork on a trombone water key before a rehearsal to maintain consistent drainage and playability. Carry spare corks for marching band or outdoor performances to swap quickly during breaks. Install on a cornet water key to restore a proper seal after long term use or minor damage. What you get A well finished cork stopper that is easy to fit and , suitable as a direct replacement for common water key cork needs.