In the case of light-liquid separators for below ground installation, the attachments can be shortened by the customer, depending on the application. The cover is suitable for class B according to EN 124. All light-liquid separators meet the requirements of class EN 858. For increased disposal convenience, the separator can also be retrofitted with direct extraction. Both the sludge catches as well as the actual separators have a maintenance opening. Optionally, alarm systems can be installed.