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 Chromed steel; it4s
accessiblest plug compound of special steel and surface treatment oxide
proof
Brass;
number one in aftermarket and motor repairs. This material is more soft
to adapt plug on used motor
Bimetallic;
brass external faced plug (for better adapt) and steel internal faced
(For durability). It4s high tech plug
Stainless steel; designed for perfect capabilities on extreme
conditions
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