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although it doesn't state the inlet pressure. i know from my other brands of jetters, you don't want to go beyond 80psi. inlet. i would purchase a pressure regulator or make one up with a jumper hose and attach it to the water source. also a pressure gauge on the low pressure side of the regulator will allow you to monitor the both the pressure and volume. your unit only requires 1.4 gpm. usually if you double the max. (2.8) your pump will be protected from cavitation.
as mark stated, the volume is important. and max. water temperature states 140 degrees. don't let your jetter run for more than a minute while the outlet hose is dead ended, as in a pressure washer spray gun turned off.
this will cause the pump to heat up as the water can't circulate to keep it cool.
most importantly on this 2 horsepower unit is ample power supply. stay away from long extension cords or undersized cords. you're better off with an extension water hose and keep the power close.