Answer
I am not aware of any "Y" or "T" fitting that would take 4000PSI water and divide it into two, 2000PSI streams.
You could contact your local high pressure hose shop and see if they have something that would work, but dealing with that much pressure is a tricky business.
Why don't you give the folks at Pressure-Pro a call at (772) 461-4486. They may be able to build you a unit with 2 pumps and 2 ports, so you can run 2 hoses at once.
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