Yamaha marching Tuba & Sousaphone (& many many others) OEM Valve Guide Set of 3 or 4 - G0141093 guides, if in doubt, email me with your model.
Fits:
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-201YEP
YEB-201M
YEB-201MS
YEB-201S
YEB-321
YEB-321S
YEB-381
YEB-381S
YEB-631S
YEB-632
YEB-632S
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-642T
YEP-642TS
YEP-842S
YEP-842TS
YFB-621
YFB-621S
YFB-822
YFB-822S
YSH-301(2)
YSH-301(3)
YSH-301S(2)
YSH-411
YSH-411S