Water Stop Central Bulb Blue is a high-quality PVC waterstop designed to prevent water leakage through concrete joints in water-retaining and water-excluding structures. Available in 200mm, 250mm & 300mm its central bulb allows controlled movement and expansion, making it ideal for use in foundations, basements, tunnels, and water tanks. The durable blue PVC material ensures excellent flexibility, chemical resistance, and long-lasting performance in harsh conditions.