Sorry I've been away so long. I'm looking at the various low flow water pumps for RVs and boats (they usually run a small faucet). The nice thing about these is they are automatic up to a set psi (usually 35-45 psi), so they turn on when the high pressure pump is drawing upon them, and then off when the back pressure is reached.
These also tend to be quieter than say a wiper pump.
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