The SR 221 pre-filter is a non-classified filter media designed to capture coarse and larger particles while extending the life of the particulate filter SR 510 (used in the Wildland First Responder Kit) and SR 710. The pre-filter is placed in the pre-filter holder which attaches to the particulate filter. Comes in packs of 10.

Wildland First Responder Kit available Here.

Particulate filter available Here.

MPN H02-0121