On Jul 25, 1:20 pm, Clive wrote:
In message
,
harry writesSo the whole plug can adrift? That would let a whole lot more steam
out than a melt.

Yes. Whilst a lead plug looks to be entirely of lead, it is in fact
mainly steel with a bored core and this restricts the amount of steam
and water needed to put out the fire.

Why is there such a steep taper on the thread on the plugs?
Wouldn't that make the whole plug fall out more easily?