An Etymological Dictionary of the German Language/Annotated/Schlauch
Schlauch, masculine, ‘leather bag, bottle, or pipe, funnel,’ from Middle High German slûch, masculine, ‘skin, slough (of a snake), leather bag, pipe’; corresponding to English slough, Swedish dialectic slug. Middle High German slûch, ‘gullet, throat; gulf, abyss,’ is a different word; late Old High German slûch, masculine, ‘yawning chasm’ (allied to schlucken). Modern High German Schlund, as well as Latin vorâgo, ‘abyss,’ allied to vorare, ‘to swallow up,’ shows a similar evolution in meaning; compare Latin faux, ‘gullet, throat, abyss.’