Search query: mask breathing valve

Product: 2 Pack Face Bandanas Washable and Rreuseable with Breathing valves Carbon Filte for Adults (black) DONGYING Black

Product: Breathable Anti-Dust Cover Valve Haze Anti-Pollution Air Breathing Filter Accessories, Flux Valves, DIY Handmade Sewing（Shipped in the US, signed in 2-5 days） ((Fan-shaped 20pcs)) HaiZhiTong

Product: Face Cover Mouth Filter Air Breathing Valves YUZHANGTONG

Product: Round white Anti Pollution Face Cover Mouth Filter Accessories - Face Cover Valves Breathing Activated Carbon Dustproof Windproof Foggy Haze Cover Filter (20pcs Light white) YUZHANGTONG

Product: 20pcs Breathable Anti-Dust Cover Valve Haze Anti-Pollution Air Breathing Filter Accessories, Flux Valves, DIY Handmade Sewing (black) Made of Abs Material, Durable to Use
Features: Replacement, Anti Haze, Face cover Accessories
SizeOuter Size: 40mm x 35mm/1.57" x 1.38" (Approx.); Inner Diameter: 18mm/0.71" (Approx.)
Suitable for sports Face cover , running Face cover , active carbon Face cover , etc.
Shipped in the US, delivered within 2-5 days FSHERO Black