A Buchan trap (alternative names: Bristol interceptor, interceptor trap and disconnecting trap) is a device fitted in a domestic sewer pipe to prevent odours entering the pipe from the public sewer and permeating the house, a common problem before individual plumbing fittings were separately trapped. The trap is made from fireclay and uses a water seal to prevent air passing from the sewer to the pipe.
A Buchan trap (alternative names: Bristol interceptor, interceptor trap and disconnecting trap) is a device fitted in a domestic sewer pipe to prevent odours entering the pipe from the public sewer and permeating the house, a common problem before individual plumbing fittings were separately trapped. The trap is made from fireclay and uses a water seal to prevent air passing from the sewer to the pipe.
Source: Wikipedia "Buchan trap" · CC BY-SA 4.0
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