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The Answer is Always Flexitallic
Style 120 has one of its contact surfaces covered and is ideally suited for comparatively narrow flange widths in circular and non-circular configurations. Typical low pressure applications include boilers, compressors, pumps and diesel and gasoline engines. This style is not recommended for standard pipe flanges. Minimum flange width 1/4" (6.4mm). Nominal gasket thickness 1/8" (3.2mm).
Style 124 is an overlapped Single Jacketed Gasket, where the filler is completely enclosed on the inside and outside diameters and on both contact surfaces. This style is more suited for high temperature applications of narrow flange widths.
The filler material is enclosed in a metal jacket which covers the inside and outside diameter of the gasket.