This may seem like a stupid question, but what is the relationship to flow and pressure in a pump to flow and pressure in nozzles. Specifically i have 5 nozzles that i am pumping into rated at 3000 Psi @ 0.84 GPM, what do i size my pump to? Do i need a pump rated for 3000 Psi @ 4.2 GPM or do i need a pump rated for 15000 Psi @ 4.2 GPM? I was under the impression that as long as my flow is the same my pressure should be the same, so if i have 4.2 GPM into the 5 nozzles at 3000psi and .84 GPM out of each nozzle totaling 4.2 GPM then my pressure shouldn't change and i should have 3000psi at each nozzle. Is this correct? Thanks in advance.