All diesel fuel contains wax. As the temperature of diesel fuel is reduced, wax crystals begin to precipitate out of solution. This temperature is known as the cloud point, the temperature at which the fuel transitions from a clear appearance to a cloudy appearance.
Glass fiber, Fuel filter paper, Composite paper
Cross Reference For P551055
DONALDSON P551055, P551056,P 55-1055, P 55-1056,