What does the marking of a concrete ring include:

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Quick installation due to the production of rings and additional parts that precisely match each other and allow you to create a well of any configuration.
High level of mechanical strength – the rings are resistant to soil shifts, groundwater pressure, and have a sufficient margin of safety to be suitable for installation in any type of soil.

Easy to maintain – regardless of the diameter and dimensions of skype data concrete rings, they all have a smooth surface inside and are easy and quick to clean if necessary.
Environmentally friendly – ​​due to the fact that concrete rings are made from completely safe components without the possibility of releasing toxins and harmful substances, the use of products even for the construction of drinking wells is completely safe.
A large selection of elements – the well volume can be any due to the availability of rings of many sizes (diameters, heights) in the assortment.
Among the disadvantages of concrete rings, it is worth highlighting such as large weight and dimensions (due to which it can be problematic to install the elements independently, special equipment is usually used), hygroscopicity and the need to perform waterproofing.

Marking according to GOST (table)
Each concrete ring (and other parts) is marked with a set of letters and numbers providing basic information about the product.

Letters - for private construction, they usually choose KS, PP, PD.
The numbers indicate the dimensions of the element.
Additional parameters – sometimes manufacturers also indicate the degree of concrete permeability (normal H, low P, especially low O).
Conventional designations of ring types according to GOST:

KLC – for the construction of urban storm sewers and drainage systems.
KVG – for water wells and gas pipelines.
KO – a support ring used as a well foundation.
KS is a wall ring that is installed as the main element of the well.
KFK – collector networks, drainage systems.