Shanghai the Guerlain Electrical Materials Co., Ltd.: T-shaped inspection mouth corrosion-resistant, high impact strength, fluid resistance is small, compared with the same caliber cast iron flow increased 30% 2 T-shaped inspection port anti-aging, long life, is the construction of drainage and sewage an ideal material for T-shaped inspection port light and durable, easy to install, can effectively speed up the progress of the project, reduce construction costs 4 T-shaped inspection port saving construction costs, relative to the traditional cast iron pipe of the same size, can greatly reduce the total cost of examination of the mouth (checkhole, checkpipe) with short pipe installed for inspection and clear through the drainage stack and long horizontal pipe, open the inspection cover. Foreign trade transport inspection port must pass through the container truck hauling container out of the container terminal, container terminal and drag boxes box exchange, document processing and information recording an important business sector!