i bought a washer from Northern Tool. 3000 psi, Honda engine, brass triplex pump. Not cheap, currently about $600, but the pump can be rebuilt by store technicians. It requires a hose with city water pressure. It automatically dilutes whatever it attached to the chemical hose 15:1 with the black nozzle. Higher pressure nozzles have more back pressure so don't suck up chemicals or detergent.
