Did a job today, toilet overflow. One of those boxed in & tiled over cisterns - very pretty but a bugger to work on.
Came across the weirdest fill valve I've ever seen.
Float on the end was just a piece of polystyrene. No diaphragm, just a rubber pad - which had perished.
Couple of good points, very easy to adjust fill level, nice big thumb wheel & easy to adjust arm length.
I suspect it was......
French!
Another odd thing, the supply to the WC & H&C of the basin were 10mm plastic, same stuff used on microbore central heating. Never seen that before either. Flow rate didn't seem to bad.