in this system, the valve is removed by turning it counterclockwise, without unscrewing the nut or anything else. Another one is placed in the same way

First video Ive looked at that had the sense to test it before putting the lid back! thanks.

Cracking video thank u

That’s a very easy valve change,a lot of cistern s now ,you can’t see the underneath of the cistern & have to dismantle the cistern ,& take it off the wall,to change the float valve,& takes 3times longer to change the float valve😡😡