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You can get rid of the bad smell of the sewer by installing an GP™ BACKFLOW PREVENTER in every siphon (drain) in the house.
The valve is NOT a plug. If you apply the valve, the drain will work normally. It will allow water to drain into the sewer
Prevent drainage from flowing back into the room; prevent leakage and overflow.
The odor in the sewage is sealed and filtered with an automatic shut-off design.
Install in seconds without any tools.
Can be connected with underground septic tanks, sewage pipes, used with shower rooms and floor drains in the basement, and can be effectively installed in PVC pipes.
You can trim the flat bottom to achieve quick drainage.