Jo-Ral Grime Gutters Jrggtrb, Baritone, Euph, Marching Brass Grime GutterJRGGTPTThis unit fits trumpets, cornets and flugelornsJRGGTRBThis unit fits 3 valve baritones and euphoniums only Also works on Marching euphoniums, trombones, and baritones Will not work on four valve instruments Grime Gutter JRGGTPT This unit fits trumpets, cornets and flugelornsJRGGTRB This unit fits 3 valve baritones and euphoniums only