The Toro YF480FNU-120 is a 8" Manual Circulating Screen Filter. The water enters the filter through a plate with four or six (4 or 6) angular holes, directing the flow in a circular pattern along the length of the filter element. The water flows through the screen element openings while solid particles are collected at the lower section of the filter. These particles can be easily removed by opening the drain valve for a short period of time. The filters are supplied with 4-6 plugs enabling the user to adjust the number of holes to suit the filtering flow rate for maximum efficiency.