HDX N95 Disposable Respirator Valve Box (15-Pack) H950V - The Home Depot
Amazon.com: 3M All-In-One Respirator, Best for Sanding, Fiberglass, Drywall, Painting, N95, Exhalation Valve Helps Direct Exhaled Air Downward, Relief From Dusts And Certain Particles, 10-Pack : Tools & Home Improvement
Spare exhalation valve for 3M 6000 series half and full facepieces