Jacketed
They are manufactured by encapsulating a soft filler in metal, being this “jacketing” construction best for face closures narrow as there are no limitations on width, diameter and type.
They have a primary seal against dripping in the metal, where engargola the metal the joint is thicker and is where it is compressed when be conformed to the flange.
Empak Spirotallic Mexicana S.A de C.V
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