A remote downstream injector for a pressure washer is a device that allows the introduction of chemicals or cleaning agents into the water stream after the pump, but before the nozzle. In a pressure washer system, water is pressurized by a pump and then expelled through a nozzle at high pressure for cleaning purposes. A downstream injector is used to introduce detergent or other chemicals into the water stream to enhance the cleaning process.

The term "downstream" refers to the fact that the chemicals are injected after the pump, in the downstream flow of water. This is in contrast to an upstream injector, which would introduce chemicals before the pump.

The remote aspect of the injector means that it can be controlled or adjusted from a distance, allowing the user to regulate the amount of detergent or chemical being mixed with the water without having to go back to the pressure washer unit. This can be particularly useful for tasks where the concentration of cleaning solution needs to be adjusted based on the specific cleaning requirements.

In summary, a remote downstream injector is a component of a pressure washer system that allows the controlled introduction of cleaning agents into the water stream for more effective and versatile cleaning.