The fittings vary according to your requirements.
Ladders – outer and inner ladders are available. The higher tanks normally have a work platform attached.
Inlets and Outlets – 50mm to 400mm diameter covers most options. The larger the outlet diameter the thicker the bottom panel and also an internal anti-vortex connection is required for large out flows.
Access Hatch – normally located on the roof above the outlet, the hatch is lockable.
Roof Sealing System – a flexible foam sealant is used around the perimeter of the tank where the roof meets the walls to keep out insects and vermin.
Floor Waste Outlet – a floor cleaning outlet can be fitted, this is particularly helpful if incoming water contains fine particles that will result in sediment build up over time.