toilet flush valve backnut how tight?

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How tight does the back but on a toilet flush valve need to? As its plastic too tight and it will break.
 
It is plastic but you'd have to really overtighten it to do any damage.
 
Reasonably tight. But not too tight. Or too loose.

It's a bit of a feel thing.

If unsure try hand +1/2, you could fill the cistern from a tap and balance it on a surface for 20minutes to test.
 

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