– Bell diameter 470 mm (18,504 inch)
– 5/4
– without strap ring and lyre holder
– piston valves
– 5th valve = rotary valve
– Bore of valve section conical 19,6 – 21,2 mm (0,772 – 0,835 inch)
– front action
– vented valves for pressure compensation
– Material of mouthpipe nickel silver
– Mouthpiece TU31
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