Colour marking for covers of service shafts

摘要

The colour markings are used to distinguish various types of covers for sewer and service shafts, e.g. of sewer gullies. The markings are in different colours to distinguish different sewers, etc. Instead of colour markings distinguished symbols may be used. In this way covers for sewer, fresh water pipe, service line etc. shafts can be rapidly and easily recognised.