Professional Clarinet Leak Test Plug Set - Essential Woodwind Instrument Repair Tool for Musicians & Band Students - Perfect for Home Practice & Studio Maintenance

Set contains four tapered rubber stoppers for checking for leaks in Bb soprano clarinet upper and lower joints.

Two stoppers are solid and two have hole in center. Put solid stopper in one end of joint and stopper with hole in opposite end. Check for leaks by closing keys and blowing in stopper with hole.