Soufloir (m)
(with) definite article: letube through which the bag of a mouth-blown bagpipe, &c. is inflated
From "souffler" [to blow].
Sachs, Curt: Real-Lexikon der Musikinstrumente: zugleich ein Polyglossar für das gesamte Instrumentengebiet [Berlin, 1913]. Hildesheim, 1964 [facsimile], p.245 (Loure).