Bottom Entry Fill Valve - Sealant or no Sealant?

[TheEsoo]

Evening all,

got to fit a bottom entry fill valve tomorrow, been recommended to use some sealant around the washer (inside the cistern). What do people think? Instructions don't mention it



Thanks

 

[Burnerman]

It shouldn't be necessary as the washer is often tapered....but it wont do any harm either.
John

 

[keego]

As above, if the washer is tapered it wont leak but if it's a cheapo flat washer I put a smear of Jet Blue to be on the safe side.

 

[MikeyGas]

Not normally needed, but I personally always put some Dow Corning 785 on the washer on the inside of the cistern.