plunger

[plop1389]

how does a plunger work
?

[almcd007]

Is it me or am I missing something here but - The round bit creates a seal around the plug hole and as you push down on the handle the air contained gets forced down the plughole into the waste pipe and hopefully shifting the blockage.

[gasman]

It will still not work like suggested earlier by almcd007 if you do not hold a wet cloth tightly on the over-flow or the pressure will just ecape through the un-covered overflow and will not go down the U-bend to shift the blockage.

[knobbynonuts]

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