I'm about to replace my leaking low pressure return hose, so this would be a convenient time to replace the power steering fluid. (It's dirty; probably hasn't been changed in 145K mi.)

I'm familiar with the flush procedure, but I wonder whether it would be better instead (or in addition) to drain the old fluid at the lowest point in the system, which would be 'A' in the photo below. But before I do something stupid, can anyone tell me whether this plug, with a reverse Torx head, is a proper drain?

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