Ryobi Pressure Washer Pump 308653054with Thermal Release Valve This is a Genuine OEM replacement part designed for use with Ryobi Pressure Washer. This item is made out of Metal.The purpose of the Pump is to create water pressure to operate the Power Washer.There are no internal parts supplied for this pump. You would need a Wrench to install this Pump. Unplug all hose that are connected to the Pump To remove the pump, remove the Four (4) Screws securing the pump to the engine You will be able to remove the pump at this time Reattach the Pump using the Four (4) Screws Reconnect hose to the Pump and test it This part is compatible with the following machines:RyobiRY80940 Pressure WasherRY80940A 3100-Psi Pressure Washer