Fusible plugs
in boilers are made of :
Cast iron
Titanium
Steel
Brass
Brass
A fusible
plug is threaded metal cylinder often made from bronze, brass, or gunmetal,
which has a tapered hole drilled completely through its length. The hole is
sealed with a metal of low melting point that flows a way if a pre-determined,
high temperature is reached.
Hence, the
correct option is (D).
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