Yamaha YEP-202M & YBH-301M, YBH-301(2), YBH-621, YBH-621(2), Marching Euphonium & Baritone horns. Pearl Valve finger Button G2241011 (silver-plate) or G2141000 (for Lacquer horns). Contact me if you wish to verify your model's fit or you have a different YEP or YBH.