Support plates prevent the sinking of telescopic extensions in loose soil and center the street cap above the extensions. The BÜSCH support plate is made of PP. This makes it mechanically highly resilient and robust. At the same time, it is insensitive to temperature and weather and resistant to attacks from aggressive alkalis and acids during winter maintenance. The BÜSCH support plate is equipped with receptacles for all BÜSCH telescopic extensions and for street caps according to DIN 4057 and DIN 4056. This ensures a perfect fit of the extension and street cap.