Imagine a long tube full of billiard balls
They are, to a rough approximation, incompressible
If you gently push a new ball into the end, one will plop out the other end
If you push one really hard into one end, one will going flying out the other end
Pressure washers are just pushing really hard on lots of little tiny balls
It doesn’t explode while it’s running without the trigger pulled because there’s a valve that lets water back out to the inlet of the pump
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