nozzle

A short tube, usually tapering, forming the vent of a hose or pipe.

A short outlet or inlet pipe projecting from the end or side of a hollow vessel, as a steam-engine cylinder or a steam boiler.

The nose of an animal; muzzle.

The part of an earbud that accomodates eartips.

“The shape of the nozzle prevents the use of aftermarket eartips.”