These styles are designed for boiler manhole cover assemblies. They are usually round, obround or oval shape, depending of course, upon the manhole plate configuration.
Style MC gaskets have pre-formed inner and/or outer rings made of spiral windings. This centering guide permits the gasket to assume its correct position and to compensate for inequalities in plate contours and fillets in cold-pressed plates as well as to prevent shouldering and pinching caused by radial misplacement.
Style MCS gaskets are manufactured with a solid metal inner and/or outer ring which also prevents over compression of the gasket in high pressure systems.

The style LS spiral wound gasket has been engineered by Flexitallic to provide an alternative to sheet gaskets in Class 150 and Class 300 service. Style LS gaskets have the inherent strength, resiliency and blowout resistance of spiral wound gaskets, yet require low bolt load for seating. They are manufactured with high purity Flexicarb flexible graphite filler or PTFE filler for optimum sealability, and are available for the full range of standard Class 150 and Class 300 flanges, as well as other non-standard low pressure flanges.

Suitable for use with flat face and raised face flanges and specified for high pressure/temperature service or where corrosive or toxic media are present.

Features an inner ring that provides additional blowout support and compression stop. Prevents flange erosion, inward buckling, and turbulent flow. Recommended for high pressure and temperature applications.

Utilizes an external ring which accurately centers gasket on flange face: provides additional radial strength to prevent gasket blowout and acts as a compression stop. A general purpose gasket suitable for use with flat face and raised face flanges.

Metallic winding suited for cyclic loading and preventing blowouts. The gasket density can be changed to accommodate specific loads.