Hydraulic fitting on BX23

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Does anyone happen to know the size and type (NPT, whatever) of the threaded fitting that is the return to tank on the right side of the hydrostatic? It's plugged from the factory, located behind the right rear tire.

I'm working on a powerbeyond circuit that will need a separate dump to tank. I saw junkman had used that fitting, but couldn't find anywhere that said what size and type of threaded fitting goes into it.

Thanks!

 

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OK, hopes this helps someone else. The return to tank port on the BX23 hydrostatic is an SAE 6 port that is threaded for 3/8 - 18 and has a recess for an o-ring.