Made up pressure washer hose, ready to fit - one wire and two wire, 4,000 to 8,700 psi, in grey non-marking, black mining and blue smooth cover. Hose is the part of the machine that gets dragged over concrete, driven on and pinched in doorways, so it is usually the first thing to fail and the cheapest thing to get right.

Pick the size first. 1/4" and 5/16" is light and flexible for domestic machines, roof and solar work. 3/8" is what almost every commercial machine runs. 1/2" is for high flow, where a smaller hose would choke the pump. Then pick the length and the ends - every hose here is supplied made up with fittings on both ends.