The karcher suction hose and filter can be used with all karcher water cooled motor pressure washers k3 k7 series simply connect one end of the hose to your karcher high pressure washer and drop the other filter end into the static water source you wish to draw water from your karcher pressure washer will now continue to work as normal without the need for a mains water supply the karcher suction hose and filter will draw water from any static water source eg water butt pond bucket and is ideal