Finally moved on from just connecting and disconnecting hoses between the thumb and other attachments. This diverter valve is a Summit Hydraulics, #8 SAE ports, 20 gpm for around $100 each [ Ссылка ] . For the KX71-3, this unit matches GPM range of the auxiliary circuit but on a second thought I may have bought the #12 40gpm model.
Be prepared for various thread and hydraulic fittings. I came across BSP (British), pipe, and then JIC and various hydraulic fitting type... honestly a real pain.
This is a simple mount project using a flat plate of steel just to hold the unit in place. Testing right after videoing this worked just fine + this finally solved my occasional connecting issue. With a bad shoulder, trying to connect two loose hoses together was always a challenge. Now, with one point solid I can use both arms and all force on one fitting.

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