In a minority of toilet cisterns the flush outlet in the bottom of the toilet cistern is 2" instead of the standard 1_". This 2" seat adaptor from FlushKING is for use when using a FlushKING cable flush valve in a toilet cistern with a 2" flush outlet hole.
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Which one is the Flush Valve in my toilet cistern?
Knowing what the part are in a toilet cistern shouldnt worry you.