Harmer Aluminium Mini Balcony Rainwater Drainage Outlet. Condition is New. Dispatched with Royal Mail 2nd Class. The Harmer Aluminium Mini Balcony Outlet is a discreet and highly effective rainwater drainage solution designed especially for use in balcony projects. Made from a durable aluminium construction, the shallow 50mm sump is designed to avoid interference with steel reinforcement and is easily installed in new and refurbishment balcony applications. Aluminium mini balcony outlet A discreet and highly effective drainage solution An unobtrusive solution for balcony uses Made from aluminium Outlet sizes: 75mm