marc_ely wrote:
Hi

I'm in the process of fitting a new bathroom suite and put the new
toilet/cistern together yesterday.

It's a modern close coupled type with twin button push flush. The
valve assembly is a weird looking thing (at least to me). There's no
overflow outlet - so I presume it has an internal (to the bowl)
overflow.

It also came with a little plastic inlet filter. Do I need this? The
toilet is fed direct from the mains, and is upstairs.

Thanks
Marc

Yes the overflow is fed directly into the bowl as part of the flushing
mechanism. Some might say it is inferior to the old-fashioned overflow
out of the side of the wall as it is not as apparent that the cistern
is overflowing. However, it saves you having to drill a hole through
the side of your house.

Yes use the inlet filter which is supposed to filter out any crud and
prevent it from contaminating the filler mechanism (which would then
stick partially open, causing the cistern to overflow!)