I have a Royal Doulton toilet. When I flush the bowl fills almost to the rim before returning to it's normal level. When a bucket of water is poured into the bowl the water level acts as normal and does not fill to top.
The above post is from a thread from 2008, but I didn't want to revive the thread. The thread suggested it was probably syphonic, though there was no photo.
Would anyone know from the image below if this Royal Doulton toilet is also syphonic?
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