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Installation and use:

1. The product is installed in a man-protected drainage pipe, which is normally leaking and ensures normal drainage. Wartime leaks fall, counter-clockwise closes and closes the drain, prevents shock waves, poison gas enters the human zone and deters groundwater recharge。
2. When the leak is installed, the leak and the wiring of the sewers are tightened and the top of the cover should be lower than 5-10 mm above the concrete level。
3. Scavenger cleaning should be carried out on a regular basis following the use of the leak installation。
4. Leak seals shall be inspected every other year and shall be derelictly treated and maintained for a prolonged period of time, using the observed ground leak seals。