Water-using appliances, such as washing machines, dishwashers, and water purifiers, all benefit from periodic inspection of hoses and connections, since rubber and plastic components degrade over years of exposure to water pressure and can develop leaks without obvious external warning signs beforehand. Vibration and leveling affect both washing machines and refrigerators, since an appliance not sitting level can experience uneven wear on internal components or, in the case of washing machines, excessive vibration during spin cycles that stresses the drum bearing.