What is "leadpipe"

Basic trombone anatomy

Trombone-2.svg

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1. tuning slide
2. counterweight
3. mouthpiece
4. slide lock ring
5. bell
6. knob/bumper
7. water key/spit valve
8. main slide
9. second slide brace/stay
10. first slide brace/stay
11. bell lock nut

In a brass instrument, a leadpipe or mouthpipe is the pipe or tube into which the mouthpiece is placed.

For example, on the illustration of a trombone, the leadpipe would be between #3 and #4, the mouthpiece and the slide lock ring. In the illustration of a French horn, the leadpipe is #2.