"O 200 waterbar" refers to an O-type (expansion joint) PVC waterstop with a width of 200 mm. In construction, "O" represents a profile with a hollow centre bulb designed to absorb structural movements, making it ideal for expansion joints in water-retaining structures.Key Technical SpecificationsType Profile: "O" denotes a center-bulb configuration for dynamic expansion and movement Function: Placed internally across concrete joints to form a continuous watertight barrier against heavy hydrostatic pressure.Standard ApplicationsWater Retaining Structures: Reservoirs, water tanks, swimming pools, sewage treatment plants, and canals.Water Excluding Structures: Deep basements, underground car parks, tunnels, retaining walls, and subways.