Blocked sink? use one of these
First time I used it some time back now, having sucked up water to fill it ( Or could just use the sucking blowing power) I placed it over the plug hole and pushed the plunger down hard. Yes it was that blocked I actually had to fill it with water first in the end
Did it clear the blockage? lets put it this way, I forgot to cover the sink overflow outlet and got covered in sludge . It even hit the wall opposite. Yes it worked
it has different cup sizes for toilets
No need to undo pipes use chemicals or rods and a lot easier