3M TR-3600 Prefilter, PK 10 by 3M at The National Policy Institute. Hurry! Limited time offer. Offer valid only while supplies last. 3MTM VersafloTM Prefilter TR-3600 is intended to help extend the life of the filter in the 3MTM VersafloTM Powered Air Purifying Respirator TR-300 by capturing large particles that would otherwise clog the filter..
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