Thanks again. I think someone mentioned that before and I forgot.I think the 3rd function is confusing you. That type of valve is designed to handle the system pressure on the tank port. Because of that it does not need power beyond to feed the next valve.
Normal spool valves like remote valves need to have power beyond to feed the next valve and a tank port for return flow. The tank port can T into any tank line except the 3rd function valve. So the set up would be like this.
Tank line from 3rd function to Power in on new valve. Power Beyond from new valve to power in on back hoe. Tank from new valve connected with a T to the tank line from your loader.
That may help explain why the Kubota valve (70090-20794) lists at over $1500 and the valves I've looked at are $150.
In any case, a T is not all that bad I guess. However, if there is no problem with flow restriction (flow through), to the BH I may consider letting the new valve stay connected all the time. Tractor max is about 9GPM, I can get 10GPM or better valves for reasonable prices. Since the supply to the BH consists of two hoses joined by a union I could separate them, add a short hose from the supply hose to the input port of the valve and use the now free host with quick connect to run from the PB port of the new valve to the BH. With appropriate fittings, etc.
The only down side I see to leaving it in is more heating of oil when using the BH heavily, due to flow restrictions from the added fittings and hoses.
As long as that would work, I'll keep chasing my tail to see how best to work that out, What I might save in added quick connect fittings might get consumed by more hose costs.
But don't let that stop helpful hints.