• Open the mask to expose the interior of the filter valve.
• According to the OPEN directions on the valve, turn the valve counter(clockwise), to separate the valve.
• Remove the filter.
• Replace the new filter, reverse the above steps, clockwise rotation of the valve, over.

Package
Quantity: as pictures 1
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*Notice*: If you buy our filters and also buy our dust masks, then can get a 45% off discount on filters. Discount Code: FILTER45
Our Dust Mask Link: https://www.skysper.com/collections/mask