Designed for use with the Waterco S75 and the Fulflo Nally skimmer boxes.  Use this vacuum plate when vacuuming your pool.  It allows you to leave the skimmer basket in the skimmer and prevents debris travelling to the pump basket.  When fitted correctly and with the hose attached the water in the skimmer box should be calm and still. Outer diameter 270mm Hole diameter 45mm