Concealed Cistern Dual Flush Valve Toilet Frame 0.82m Wall Hung WC Hidden Unit. This WRAS-approved WC frame and cistern makes installing your wall hung toilet so easy. Including a concealed cistern, full pre-wall installation bolt kit and solid metal frame (tested to withstand up to 400kg), you have all you'll need to make installation quick, easy and effective. Then the confidence that your new installation is completely robust and strong. With all the mechanical elements hidden within the wall, you'll have more space and a better looking bathroom. Includes 90 degree waste bend, straight & angled soil pipe, full pre-wall installation bolt kit. The Siphon can be modified to provide a full flush of either 6L/3L (standard) or 4.5L/3L (eco).