3 valve, all Yamaha OEM parts. Euphonium YEP-201 YEP-201M Valve Repair Kit (after 1986). 3 each guides, springs, valve stem felts & pads, top cap felts & pads, stem washers (metal), and 2 each water key corks.
YEP-202M and YBH-301M & orchestral Baritone YBH-301 are different kits. Contact me with your model if you wish to verify your model's fit.