This reducer would normally be used on the main outlet of the Gutter Mate Diverter and Filter and is suitable for downpipes which are between 40- 50mm in diameter. This part will enable you to install the Gutter Mate Diverter & Filter to your downpipe when your downpipe in order to collect rainwater. Gutter Mate 68mm female to 50mm male reducer in white, black or brown. The application for this size of reducer is for connection to downpipes on greenhouses, sheds and garages.