PP drainage reducer DN/OD 72-100x50mm for connecting two drainage pipes, universal, yellow color KDR21

Universal drainage reducer for connecting pipes of different diameters

The KDR21 coupling enables connecting a 50 mm drainage pipe with a pipe ranging from 72 to 100 mm in diameter – without changing the system, even if you switch pipe suppliers. Developed and patented by KARMAT, it requires no cutting of holes or special tools. Installation is simple: cut the pipes to equal length and insert them into the coupling – just apply light pressure until they snap into place. No lubrication or gluing is required.

Made of polypropylene, it is resistant to aggressive chemical compounds – e.g., plant protection products or mineral salts found in drainage soils. This ensures not only durability but also environmental safety: the material does not leach, does not react with the soil, and does not degrade under the influence of moisture or temperature.

The connection is tight and durable – confirmed by tests. There is no need for additional seals or clamps. The system works equally well when connecting a 72 mm pipe to a 50 mm pipe as it does with a 100 mm to a 50 mm pipe – one coupling replaces a whole range of reducers.

For the installer: you save time, storage space, and avoid ordering errors. For the end user: the system operates without failure for years, even under soil load or changes in hydrological conditions.

Yellow color – easy to identify on the construction site.