Valve Guide for Yamaha - Euphonium Tuba Sousaphone - Set of 3Compatible Yamaha Models:Euphonium:YEP-100S~YEP-100SA~YEP-201(2)~YEP-201M~YEP-201MS~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(2)~YEP-642~YEP-642(NEO)~YEP-642S~YEP-642S(NEO)~YEP-842STuba: YBB-100S~YBB-103(2)~YBB-103S(2)~YBB-104~YBB-104S~YBB-105~YBB-105M~YBB-105MS~YBB-105S~YBB-110S~YBB-201(2)~YBB-201M~YBB-201MS~YBB-201S(2)~YBB-202M~YBB-202MS~YBB-321(2)~YBB-321S(2)~YBB-621~YBB-621S~YBB-631~YBB-631S~YBB-632~YBB-632S YCB-621~YCB-621S~YCB-822~YCB-822S YEB-201~YEB-201M~YEB-201MS~YEB-201S~YEB-321~YEB-321S~YEB-381~YEB-381S~YEB-631S~YEB-632~YEB-632S YFB-621~YFB-621S~YFB-822~YFB-822SSousaphone:YSH-301(2)~YSH-301(3)~YSH-301S(2)~YSH-411~YSH-411S