If you know the meaning of the following symbol Click for a larger image (which is likely related to the load or standard of the lid), click on the question mark
Translation of the text on the cover: The HaGihon is at your service Drainage The HaGihon Company Ltd. Jerusalem Water and Sewage Corporation HaGihon Logo EN124 D400 0600 Kurdieh brothers Standard mark of the Standards Institute of Israel MK