Yamaha W3484610 Tuba/Euphonium Valve Felt

Goes inside the piston head

Dampens the piston head

Models it is used in: EP-100S, EP-100SA, YEP-201, YEP-201(2), YEP-201M, YEP-201MS, YEP-201S, YEP-201S(2), YEP-211(2), YEP-211S(2), YEP-321(2), YEP-321S(2), YEP-621(2), YEP-621S(2), YEP-641(2), YEP-641S, YEP-641S(2), BB-100S, YBB-103(2), YBB-103S(2) BB-110S.