Wall spacer made from rigid PVC Tube with extra wide contact surface to formwork with an inner diameter of 22m/m and chamfered end pieces. The assembly consists of  the Tube, two end pieces with wide double rims and a serrated labyrinth seal and three plugs for installation after dismantling of the formwork.

After installation of the plugs, the chamfered ends are grouted. The material is non-biodegradable.

These products have been tested in Iran by SANO engineering laboratory and in Austria and conform to DIN 1048 for water pressure up to 0.5 N/mm2 and suitability for installation in sewage plants.