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Wow..Yep, it is a BIG,... little understood subject, but facinating nevertheless. Thanks BUT Why were stoppers apparently phased out?

Thanks Hugh "Stopper may well be superfluous to requirements on a modern estate, where the road gullies should be connected to the Surface Water Drainage system." "Only really need to seal the pots off on older streets where the gullies may be connected to a Combined system, and the rainwater...

I would agree, the prime design feature is for cleaning., but it does make it more difficult for rats to enter or exit the sewer ...as an aditional feature. ! But they must be in place, where the feature is present.

Hi, I am having GREAT difficulty in convincing the hoa to replace all the stoppers ,as they have been removed over the years. They must be left in to avoid detritus overflowing into the drain. They also serve to indicate when the gully needs emptying, as the gully will overtop onto the...