Before revision: A Buchan Trap (alternative names: Bristol interceptor, interceptor trap and disconnecting trap) is a device made from fireclay located in a domestic sewer pipe to prevent vermin entering the pipe .
After revision: A Buchan Trap (alternative names: Bristol interceptor, interceptor trap and disconnecting trap) is a device made from fireclay located in a domestic sewer pipe to prevent odoursfrom the public sewer and thus the property served by the drain entering the pipe .