Delta FlexiDri Plugs are patented expandable fixing plugs which offer extra grip and are unique to Delta Membrane Systems Limited. Delta FlexiDri Plus are suitable for both Delta MS500 and Delta PT membranes. These fixing plugs have a centrally located pin which when inserted expand to allow the plug a firm grip into the substrate. The pin has an internal shank that accommodates a 5mm dia. screw for subsequent installation of wall ties and/or dry lining systems (10mm shank x 90mm).