Buchan trap

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. The trap uses a water seal to prevent rats and mice climbing any further along the pipe. Waste flows from the house through a U-bend in the trap. This m...
Found on http://en.wikipedia.org/wiki/Buchan_trap
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