There is no check valve installed, and the water fee is borne by many households.

No promises. According to the notice of inquiring about the usage of tap water, the check valve of water meter was installed by the water company, and the water fee caused by not installing the check valve is too high, so the user does not need to bear additional expenses, and needs to contact the water company to install the check valve in time. The check valve can be controlled by water pressure and installed behind the water meter, which can prevent the residual water in the pipeline from flowing backwards when the water supply is stopped, resulting in water meter damage and water resource waste.