Oase aquaskim 40 pond surface skimmerr powerful amp effective for removing debries of the surface of your poolr through a two part telescopic tube it is infinitely height adjustablein addition the float automatically bridges water level differentials up to 160 mm which can easily occur due to rainfall or strong evaporationr simple height adjustment no tools requiredr minimun height 537mmr maximum height 787mmr the lower part of the tube has a telescopic nut for convenient adjustmentr eve