kungfuren 2 Sets Sports Cycling Masks with Activated Carbon Filter, Cycling Mask with 4 Breathing Valve and 8 Soft Foam…

Amazon.com Price:  (as of 15/01/2021 16:43 PST- Details)

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