Trumpet 3rd valve slide stop screw lock nut
Fits models:
- Jupiter 600ML - prior to serial number 602700 with mouthpiece receiver beginning with STR
- Jupiter 600MS - prior to serial number 602700 with mouthpiece receiver beginning with STR
- Jupiter 600NL - prior to serial number 602700 with mouthpiece receiver beginning with STR
- Jupiter 600NS - prior to serial number 602700 with mouthpiece receiver beginning with STR
- Jupiter 606MRL - prior to serial number 602700 with mouthpiece receiver beginning with STR