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a rain shower waste pipe is basically a gob in the bottom of the shower bath to have weewee flux out of the washbasin or bathing tub .
The cascade drainpipe is cover by a roof , a projection screen with several modest golf hole or slot for the pee to flux through .
This allow pee to run out out of the bathing tub but still grab much of the haircloth and other rubble that might otherwise choke the waste pipe .
The Plug
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Most shower bath also have a path to shut off the drainpipe if , for lesson , the drug user care to take a bathtub .
aged cascade drain often had a caoutchouc wad that could be agitate into the drainage to intercept the leak of piss .
new shower commonly have a build - in valve with a toggle switch that can open up or close up the exhibitor waste pipe .
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The overflow
If the cascade is continue scarper while the drainage is close , the weewee will finally spill over the tubful .
To forestall this from befall , most shower have an flood pipage .
The outpouring is a 2d organ pipe that enter the bath above the cascade drainpipe but below the flange .
If weewee get as gamy as the outpouring , it will mechanically menstruate in , thus preclude the bath from overfill and flood the elbow room .
The Trap
The overspill and the normal rain shower drainage are both sequester to pipework , which link up beneath the tubful .
The urine then flow downwardly into the sand trap , a uracil - forge subdivision of pipage underneath the vat .
When urine feed down and then back up through the yap , some piss stay behind .
This pee form a seal of approval , which prevent sewerage gasoline from bubble back up through the waste pipe and induce a nauseating foetor .
After the maw , the water supply from the drainage fall in with the swallow hole and can line and flux down into the sewerage or infected scheme .
