We offer two styles of water retainers: collapsible water retainer dams, and semi permanent water dams. Collapsible water retainer dams are a low-profile, pliable rubber dam that can be easily applied to any shower threshold to contain water. Installation is simple, with two ply tape applied by hand. It is wheelchair friendly as it collapses and expands upon entering/exiting the shower. Semi-Permanent Water Dams are temporary plastic barriers that can be placed in a barrier free shower entry creating a threshold to contain water.