Water Stopper A waterstopper is an element of a concrete structure, intended to prevent the passages of fluids (such as water) when embedded in and running continuously through concrete joints. Waterstopper are grouped in two distinct categories. PVC Water Stopper Three Valve Water Stopper Black Swellable Water Stopper Pvc Water Stopper Rubber Water Stopper Installation Pvc Water Stopper Rubber Pvc Water Stopper Rubber Pvc Water Stopper Rubber Pvc Water Stopper Rubber