ONE Finger Button - Silver Plate

TR200S Bach  Bb Trumpet
VBS196 Bach  Piccolo Trumpet
184 Bach  Cornet
180 Bach  Bb Trumpet
C180 Bach  C Trumpet
LT180 Bach  Bb Trumpet
D180 Bach  D Trumpet
C180SL229CC - Chicago C Bach  C Trumpet
196 Bach  Piccolo Trumpet
LT180 - Lightweight Bb Bach Strad - ML Bore - Silver Plate Bach  Bb Trumpet
184S Bach  Cornet
180 - Bb Bach Strad - ML Bore - Silver Plate Bach  Bb Trumpet
180 - Bb Bach Strad - L Bore - Silver Plate Bach  Bb Trumpet
C180 - C Bach Strad - L Bore - Silver Plate Bach  C Trumpet
AC190S - Artisan C - Silver Plate Bach  C Trumpet
C180SL229PC - Philadelphia C Bach  C Trumpet
LR180 Bach  Bb Trumpet
181 Bach  Cornet
189 Bach  Eb Trumpet
AB190S - Artisan Bb - Silver Plate Bach  Bb Trumpet
LT180 - Lightweight Bb Bach Strad - L Bore - Silver Plate Bach  Bb Trumpet
LR180 - Reverse Mouthpipe - Bb Bach Strad - ML Bore - Silver Plate Bach  Bb Trumpet
LR180 - Reverse Mouthpipe - Bb Bach Strad - L Bore - Silver Plate Bach  Bb Trumpet
180 - Bb Bach Strad - M Bore - Silver Plate Bach  Bb Trumpet
181 - Bb Bach Strad - ML Bore - Silver Plate Bach  Cornet

These SHOULD work on the TR300 BUT this is silver not nickel and the style is a little different but the thread size is correct.