Replacement black jaw gasket for use with 3M™ M-400 Headtop Prolong the service life of your equipment with 3M™ Versaflo™ Jaw Gasket, M-441. Our jaw gasket is designed to replace worn or damaged parts in 3M™ Versaflo™ M-400 Headtop. Prolong the service life of your equipment with 3M™ Versaflo™ Jaw Gasket, M-441. Our jaw gasket is designed to replace worn or damaged parts in 3M™ Versaflo™ M-400 Headtop.