Stainless Steel Extension Box Stainless Steel Extension Box Product Code: FR-EXTProduct Enquiry test To prevent automated spam submissions leave this field empty. TabsOverviewFRCM-EXT extension box is designed to house the plumbing system for a Franke Combination WC & Basin FRCM1 where a service duct is not available. The 30° angle of the top reduces the likelihood of people standing on or placing items on top. The extension box has three access panels which give access to our Warden plumbing & electrical items and for the fixing (see separate literature). The extension box is fitted to the wall using dynabolts or chemset type bolts to suit structure (by others). The Combination unit is bolted to the extension box through the access panels. Also allows for S-Trap installations. Warning: Do not use dimensions for set out purposes. Refer to your sales representative for accurate dimensions. ModelsFRCM-EXT - Extension box. Downloads Tech Data