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Trying to figure out the right orifice size to use for my pressure washer. I use it for washing my car only. I bought a 4.0 orifice 40 degree nozzle, but am thinking I may have messed up. Machine specs: AR610 Max 1.9 GPM, rated: 1.7 GPM Max 1350 PSI, rated: 1200 PSI I'm thinking the 4.0...