Jim,

Where would I get the kit that stops my existing bog overflowing into my extension, and what is it called.

Can I get the kit oneline or from a plumbers merchant
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Have a look at this page:
http://www.screwfix.com/app/sfd/cat/pro.jsp?id=36240&ts=58941

It's a combined overflow and flapper valve, not a syphon. I've got a similar
one in my toilet and it works better than a syphon, giving a  better flush.

"Rod"  wrote in message 
news:4363EF29.1060505@gREMOVEmail.com...
Jim,

Where would I get the kit that stops my existing bog overflowing into my
extension, and what is it called.

Can I get the kit oneline or from a plumbers merchant
-- 

Remove spamtrap to reply.