Can my unit be connected to a portable water supply? Your pressure washer must be connected to a main water supply with a constant inlet pressure of up to 0.7MPa (7 bars, also equal to 100 psi). Portable water supplies, tanks, and pumps cannot provide a constant water pressure, which can damage the motor of your pressure washer. Related articles Can I use another brand's accessory with my Sun Joe pressure washer? I am missing the needle clean out tool for my Sun Joe Pressure Washer Can my SPX2690-SJG unit be connected to a portable water supply? MJ401C-BLD Replacement Blade Sun Joe High-Pressure Washer Hose Compatibility Guide