POOL FILTER LID STANDARD QUALITY/EARTHCO/AQUAMAX/ (WITH O RING AND SCREWS) The lid fits the Quality Superflo/Eearthco/Aquaflo/Aquamax/Nami and Aquaking sand filter. Excludes the O-ring.This is the most common sand filter lid in most swimming pools. Outer inner diameter: 20.5cm Inner diameter: 15.5cm