Internal Drain Couplings

Fernco, previously known as Flexseal, manufactures a wide range of couplings that connect rainwater and wastewater pipelines using the internal surface, we call these ‘Icon’ (internal connection) couplings.


  • Significantly reduces labour time for connecting problem pipes
  • Watertight connection on any pipe material
  • Connects pipes of differing or irregular outside diameters
  • No need to expose external surface of pipe
  • Pipe stop indicates that the product is properly installed, when it is flush to the pipe end
  • Passes pressure tests
  • Provides shear load protection
  • The whole range conforms to the requirements of BS EN 295-4:2013