This is a tenor trombone 45 wrap tube 

These tubes are typically used in pairs. 80 tubes replace the 45 and 90 tubes on an axial conversion.  Use 2 for a cleaner look, and a more open softer curve for air flow. 

Used in tenor trombone wraps

This tube is used in some rotary conversions. Inner span is  2.15"  Outer span is 3.35"  Tube OD is .600"  Tube ID is .560"

There is nothing like the sound of nickel tubes! Two 80 tubes can replace the 45 and 90 tubes on an axial conversion for a cleaner look, and softer more sweeping curve for better air flow. 

This tube makes some tenor rotary conversions much easier and cleaner.  It lends itself to a different look on the tenor wrap

 This is a tenor trombone small 90 wrap tube 

 This is a tenor trombone large 90 wrap tube