Yamaha Water Key Corks (for almost any YCR/YTR/YFH/YMP/YHR/YEP/YxB/SH)

Fit my Yamaha 667D just fine

Real cork, easy installation, working well so far.

Perfect fit for my Yamaha trombone. After struggling to get the original cork out, I assumed this would have an adhesive back. It doesn't. But it set easily into place and I haven't had any issues with it in the 5 months I've had it.