The 300mm 12in bailey drain test plug with brass cap is a professional solution for testing large diameter sewer and drainage systems. This robust plug incorporates centre locking design with steel plates, steel wing nuts and a brass blanking cap, providing the strength and reliability demanded by major commercial and industrial drainage projects. The 300mm size is specifically designed for main sewer lines, industrial drainage systems, and large commercial installations where substantial sealing capacity is required. The brass cap maintains corrosion resistance even in challenging environments, whilst the steel construction ensures structural integrity under high testing pressures. Features and benefits bull 300mm 12in size perfect for main sewer lines and industrial drains bull robust steel plates withstand high testing pressures bull brass blanking cap provides long term corrosion resistance bull centre locking design delivers even pressure distribution bull steel wing nuts enable secure installation without tools bull suitable for air or water testing of large diameter systems specifications tool type drain test plug