Train Control Systems HO 1708 UNIV-SH3-C Universal Speaker Housing with Speaker

Fits TCS 20mm Round Speaker (Use in Loco Body with See-Through Fan Housing)

Universal speaker housing for the TCS 20mm round speaker (included).
This simple, closed design channels both the front and rear audio out the front of the speaker housing.
These micro speakers do not work without being mounted to an enclosure (like this one) or to a piece of the locomotive shell.

Dimensions 0.87" diameter x 0.24" or 22mm diameter x 6mm