I'm new to this, thx in advance for any help. I have a '15 RX350 FSport and was doing regular checkup when I saw this. It's on rear axle. Replace?

Sulu

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Do you have a picture that places this in context? Where exactly is this on the rear axle?

I do not know what this is but am curious where it is. Knowing where it is may help to determine what its purpose is.