I've seen them on a few prop machines and searched here and via Google but couldn't find anything.
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$\begingroup$ Oh it is indeed, I'm sorry. $\endgroup$ – ovmcit5eoivc4 Nov 9 '18 at 15:49
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That is a weather radar pod. On multi-engine aircraft, it is typical to install radar in the nose. But that is not possible in a single engine propeller plane. So, when radar is installed in one, it is most common to hang it under a wing as shown in the photo. Here's a link to such a pod