3"/90mm Aerated Bottom Drains For Concrete Ponds  Ref: 18
Fabricated Bottom Drain - Sump Details

Sump Outside Diameter 200mm
Sump Wall 5mm (approx)
Sump Flange Diameter 300mm
Sump Flange Thickness 6mm
Liner Ring Thickness 6mm
Self Tapping Screws for Flange Not Applicable
Base Thickness 6mm
Socket for Stem - Welded to Base 48.3mm
Water outlet 4" or 110mm
Inlet for Air Hose 1" or 1 1/2"
32mm or 40mm