This product allows you to connect a roundline downpipe to a squareline guttering system. The adaptor pushes onto the squareline running outlet and then the roundline downpipe pushes into to roundline connector allowing you to have a roundline downpipe running from your guttering. This product is compatible with most standard squareline and roundline guttering ranges except for the Osma, Marley or Terrain ranges. The squared gutter system has a prefitted seal retaining clip system for a fast user friendly installation.