Abstract: A wheeled fire hydrant diffuser has a wheeled frame having a trailering tongue for attachment to the rear of a towing vehicle. The housing is formed with walls and attached to the wheeled frame and has an inner chamber therein having an open bottom. An elongated walled passageway extends through the housing chamber and has an opening therein facing the top of the housing. A flexible fire hose is attached to a coupling in the walled passageway and has a removable fire hydrant coupling on the other end thereof so that the fire hose can be connected to the fire hydrant and the fire hydrant opened to direct water therefrom through the walled passageway into the housing inner chamber and out the bottom of the housing inner chamber. The housing has a storage compartment for storing the flexible fire hose.