Folks, I started smelling sewer gas in the bath in our basement bathroom. I identified the source as the tub drain. I crawled into the cabinet on the floor and discovered there’s no trap for the drain, and it appears it wasn’t installed because there is no room for one. Are there any alternatives to traps, that can be installed in super close quarters? Some kind of gas-effective check valve, maybe? I have under seven inches laterally, and maybe 5” on the vertical to work with. The biggest issue is the lateral confinement between the actual tub drain and a tee it runs straight line to.
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