#html-body [data-pb-style=AHD36MB]{justify-content:flex-start;display:flex;flex-direction:column;background-position:left top;background-size:cover;background-repeat:no-repeat;background-attachment:scroll}Tilbakeslagsventil hindrer vann i å komme inn i luftpumpen, f.eks. ved strømbrudd eller andre ting. Vedlikeholdsfri.