Choosing a Control Valve for Rear Remotes

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The Husco is a series 5000 but the configuration numbers are proprietary so no help there. I can't make out the letters and numbers below the Vickers emblem.
That might be the model designation.

I have all but given up on the Husco. The numbers near the “Vickers” is a patent number.
I plan to “blow smoke” of sorts through the Vickers valve, this while operating the valve. I hope to gain a clear understanding of its operation this way.

I am in the process of creating a control lever to attach