Hey everyone, I’ve finally decided to buy an xjet m5 after trying to use my pressure washer’s downstream it came with which didn’t work at all and after buying a downstream injector from BE outdoor equipment that did not work either. My pressure washer is a 3200 psi 2.5 GPM so according to the nozzles available I would be #13 for the psi but #7 for the GPM. I’m assuming I need to buy according to my pressure washer’s PSI as opposed to it’s GPM?
X-jet nozzle selection is based on your pump’s rated gpm output.
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Hold off on the Xjet until you get a pressure washer.
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I see what you did there 
. I need to make do with what I have for now, just starting out.
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Your GPM is constant, it should always be 2.5GPM as long as your pump is spinning the correct RPM. So, base the nozzle size off your GPM and then whatever PSI you would like to achieve.
2.5GPM @ 3200PSI = #3 nozzle
2.5GPM @ 2000PSI = #3.5 nozzle
2.5GPM @ 1500PSI = #4 nozzle
2.5GPM @ 1250PSI = #4.5
2.5GPM @ 1000PSI = #5
2.5GPM @ 750PSI = #6
2.5GPM @ 500PSI = #7
