To block even the smallest of particles, the one-pack of Reusable Foam Filters for Puritan Bennett 420G, 420S, 420SP, 420E CPAPs is made of polyurethane foam.
Designed for the Puritan Bennett 420G, 420S, 420SP, 420E CPAP Machine, the filter is washable and reusable and should be changed every six months.
The site is great and though this filter was a little pricey for just one, it fit perfectly, like original equipment into my CPAP machine. I will be coming here for all future needs until I find a better solution.
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