TDI Multicor is an insulated cavity closer that is suitable for use in severe weather conditions. One size fits all - can be cut to fit any window size. The TDI Multicor insulated cavity closer is manufactured from high quality PVCu and comes complete with flexible weatherseal and fits all cavity widths up to 100mm wide. Very competitively priced Multicor can be built in at construction stage or retro fit, there are no clips required with Multicor cavity closer, simply nail to brickwork. Multicor is designed to be suitable for use with both PVCu and wooden frames.