Reducing is also called BIG-SMAILL-PIPE, to
connect the tubes of different sizes; general
it is divided into different-diameter pipe concentric
and eccentric two different-diameter pipe, when
the legislature with different-diameter pipe
after the two-port projection is concentric
circles, it Care is different-diameter pipe,
and the eccentricity of the projection is different-diameter
pipe, cut in small round cylindrical.
HS:73079300
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