The RYOBI Pump Protector provides your pressure washer with the protection it needs for longer life. The biodegradable formula not only lubricates the internal metal parts, ensuring smooth operation, but also provides protection against rust and corrosion. By preventing mineral deposits and hard water buildup, pump protector helps avoid clogs and damage to your pump over time. Using pump protector is crucial during winter months, as it prevents your pump from freezing. Whether you're storing your pressure washer for an extended period, or in between uses RYOBI Pump Protector maintains the pump's efficiency and extends the life of your pressure washer.