Top Valve Cap Felt Bumper Ring Washer Rubber Compatible Models: Bb Trumpet: Benge 90BL ~ Conn 52BSP ~ Conn 52B ~ King 1117 ~ King 1117SP ~ Conn 1BSP ~ Benge 90B ~ King 2055S - Silver Flair ~ Conn 1B - Lacquer ~ Benge 3X ~ Benge 3XSP ~ King 301 ~ Bach TR305 ~ Bach TR305SBP ~ King 600 ~ King 601 ~ King 601SP ~ King 601N ~ Conn 23BN ~ Conn 23B ~ Conn 23BSP ~ Conn 27B C Trumpet: Conn 1B50CSP ~ Conn 1B50C ~ Benge 90C ~ Conn 51BSP ~ Conn 51B Piccolo Trumpet: Benge 4PSP ~ Benge 4P Cornet: King 2220SP ~ King 2220 ~ King 603 ~ King 604 ~ King 602SP ~ King 603SP ~ Conn 22A ~ King 602 ~ King 605SP ~ King 605 ~ Conn 34A ~ Bach CR301H ~ Conn 35A ~ Conn 34ASP Flugelhorn: Conn 1FR ~ Conn 1FRSP ~ King 2020SP ~ King 2020 Marching Euphonium: King 1129 ~ King 1129SP Marching French Horn: Conn 134E ~ Conn 134ESP ~ King 1122SP ~ King 1122 Marching Mellophone: King 1121SP ~ King 1121 ~ Bach B1105TH ~ Bach B1105THS