| Looks like they put an L on the left side horn for assembly purposes. Only difference I can see in them is the way they clocked the drain opening which is probably why they stamped the one with an "L". But, when I test them individually they have a different sounding pitch too. There's an adjustment screw on them which I tried turning to different positions but it didn't seem to change the pitch. Maybe they just don't have the same exact pitch between them, IDK.
 
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