Liquid plumr bellows sink drain plunger 6 A boiler that has

Liquid plumr bellows sink & drain plunger, $6. A boiler that has a loss of feed water and is permitted to boil dry can be extremely dangerous if feed water is then sent into the empty boiler, the small cascade of incoming water instantly boils on contact with the superheated metal shell and leads to a violent explosion that cannot be controlled even by safety steam valves draining.

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