STA-BIL® Pump Protector protects pressure washer pumps and internal components, like pistons and seals. The special formulation delivers superior lubrication for all the moving parts and prevents buildup of harmful water and mineral deposits. This pressure washer pump protector also provides anti-freeze protection to prevent the pump from pump freezing. The pressure washer pump protector hose easily attaches to pressure washer inlet, quickly dispensing fluid and preparing your pressure washer for storage.