Can this fit a jupiter jtr-600?

Hi, I don't have a definite answer but I own a Yamaha YTR2330 with a standard bell and it fits fine. I would say that unless the Jupiter has a completely non standard bell it will fit fine. It is tapered to fit a range of bells.

Can this be used with a pocket trumpet?

I got one for my grandson, and it fits his. Some pocket Trumpets, depending on the maker my have the bell tighter? But as far as I know it fits my grandson's

Will this fit in a standard flugelhorn bell? If not, does anyone have a recommendation for a flugelhorn fitted harmon mute?

It fits a cornet bell, think it might be too small for a flugelhorn 😔

Is the plunger supposed to be included with the harmon model b? it was not included with mine.

The pluger is kinda the main feature on this. It changes the sound in a million ways. Mine definitely came with the sliding horn plunger. That is really what drops the volume a bunch

Item Weight	109 g
Product Dimensions	8.26 x 8.89 x 13.97 cm; 108.86 g
Item model number	B
Body Material	Aluminum
Color Name	Limited Edition
Material Type	Aluminum
Instrument Key	B
Size	5.50 x 3.50 x 3.25 inches

Harmon B - Aluminum Wow Wow Trumpet Mute

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