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This special sewer manhole cover and ordinary manhole cover mainly highlights two purposes. First, it can detect the concentration of methane in the sewer. It serves as a warning to prevent the explosion of methane in excess of the standard. The second point can be charged with biogas and stored in the built-in battery of the manhole cover, which is convenient for providing lighting for the sewer maintenance workers.
Designers: Wang Yi & Ji Ze
Mosquito Mats,Insect Killer,Mosquito Tablets
Pest Control Insecticide,Electrical Products Co., Ltd. , http://www.nsmosquitos.com