The water swellable sealing products by Movex are based on the unique Active Sealing Technology. Our products expand on contact with water. This is how they create an active seal to combat moisture infiltration. The Movex products are self-correcting and thus also sealing the unevenness and imperfections of the concrete. It fits in spacers with an inner diameter of 22, 24 or 26mm and can be customized to your specific formwork.