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:D Success! The McAlpine Anti Cross-Flow Rodent Barrier Valve works! Thanks guys, this was a great solution to this problem. I thought I'd have to rip out all the drains and reset the falls etc. A very messy and costly process, I would think!. :x I had to buy a new straight connector...

Just an update, I've found the McAlpine valve mentioned and will get one next week and try it out.McAlpine ref No is ARB-1. Thanks again. See attached drawing. http://s181.photobucket.com/albums/x320/ceejay02/mcalpine%20fitting/?action=view&current=mcalpinefitting.jpg

Ive taken some photos and made a drawing which I have hopefully attached. Thanks again for all the help. http://s181.photobucket.com/albums/x320/ceejay02/

Thanks for all the info guys, there is some boxing in around the WC's, Im planning to strip it out tonight and have a good look at the arrangement of the falls etc. some factI do know are: - The drain has a vent stack that goes up to the roof. - I think there is little fall if any between...

Just moved into a 10year old house, bathroom and en-suite wc's are back to back, sharing same drain. Drain runs horizontally left to right with about 600 - 700mm between connections. WC1 ------- WC2-------- TO EXTERNAL DRAIN Problem is that wc1 seams to get a back flow from wc2 causing...