The 3M™ Rugged Comfort Quick Latch Head Harness Assembly 6582QL is a replacement part for the 3M™ Rugged Comfort Quick Latch Half Facepiece Reusable Respirator 6500QL Series.3M Rugged Comfort Quick Latch Head Harness Assembly 6582QL is to be used with compatible products. Replacement part can extend respiratory equipment service life.