This excellent Skimmer faceplate measures 8-1/4" wide x 8" high and inner opening dimensions 5-7/8" x 5-1/2". This time-saving closure device saves extra money when winterizing pools by preventing freeze damage. Simply replace your skimmer plate with the Aquador face plate (requires phillips head screwdriver) and snap on the freeze-proof plastic closure. Your skimmer is now protected from damage associated with freezing water. With Aquador; there's no need for costly water drain downs in the fall. The Aquador stays flexible to -80 degrees.