Yes, but it's important to understand that you will nowhere near be able to reach the pressures of a pressure washer using an air compressor. Pressure washers start at around 1200 PSI while an air compressor would be very fortunate to offer you even 180 PSI. However, by attaching a spray gun to your air compressor hose, and connecting your garden hose from an outdoor faucet to the spray gun, you will be able to spray water up to twice as pressurized as your normal garden hose.