If you have a sump pump all cords and discharge pipe must pass through the cover and be sealed.
Do you have water that flows into the top of the basin when it rains or appliances draining into the sump? You will want a special sump cover drain. These allow water down but stops air draw from the house.
If you have any untrapped drains using the sump these will have to be retrofitted with a special drain.
A good design will allow for easy access to the sump basin by using aninspection plug. Otherwise the whole cover will have to be removed.
Find pipe and cord seals. Inspection ports, windows and plugs. And more!