The 375mm 15in bailey drain test plug with brass cap represents a heavy duty solution for testing extra large diameter sewer and drainage systems. This substantial plug features centre locking design with steel plates, steel wing nuts and a brass blanking cap, engineered to handle the most demanding commercial and industrial drainage testing applications. The 375mm size is essential for major infrastructure projects, large industrial facilities, and main sewer interceptors where maximum sealing capacity is critical. The brass cap ensures reliable corrosion resistance over extended service life, whilst the steel components provide exceptional structural strength for high pressure testing scenarios. Features and benefits bull 375mm 15in size for extra large diameter drainage systems bull heavy duty steel construction handles demanding test conditions bull corrosion resistant brass cap ensures long term reliability bull centre locking mechanism provides secure, even sealing bull steel wing nuts allow firm installation and removal bull ideal for major infrastructure and industrial applications specifications tool type drain test plug