First: well cover marking: if it is a well cover for sewage treatment pipeline, the well cover surface shall be marked with "sewage". If it is a well cover for rainwater treatment pipeline, the well cover surface shall be marked with "rain". The two shall be distinguished, and the marks shall be clear and easy to view.

Second: the setting of inner and outer covers: in addition to the special requirements for the surface of the stainless steel manhole cover, if the stainless steel manhole cover with protective cover base is divided, the inner cover shall also be set.

Third: the internal setting of the well cover: for the well cover made of stainless steel, the selection shall be determined according to the medium of the drainage pipe, the diameter of the well bore, the pipe material of the well brief and other relevant factors.

Fourth: bearing capacity: determine the bearing capacity of the stainless steel manhole cover, ask for the enterprise standard of the composite manhole cover enterprise, and check the bearing capacity of the composite manhole cover specified in the enterprise standard.