The 3M™ Air Inlet Gasket 7999 is a replacement part designed for use in centre inlet port of 3M™ Full Facepiece Reusable Respirator 7000 Series.The 3M Air Inlet Gasket 7999 is to be used with 3M Full Facepiece Reusable Respirator 7000 Series. Replacement part can extend respiratory equipment service life.