Stemming the flow

By Barry Fox When the valve on a WC cistern wears out, it no longer cuts off the water supply when the cistern is full. The result is usually a stream of water gushing out into the street. Now B. McManus of Yorkshire has patented a way of preventing this (GB 2 334 043). The design has a secondary float chamber which is normally dry. When the main cistern overflows, a float in the second chamber rises,
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