Some types of clip-around mini trunking corners have adhesive around the back. Be sure to remove the backing in the adhesive prior to deciding to press the corner parts into area if This can be the situation. Discontinued Ega Mini would be the number of PVCu mini trunking from MK. https://minitrunkingaccessories01234.qodsblog.com/28036240/5-easy-facts-about-mini-trunking-described