For use with MaxiGuard Series Cartridges R701-A1 and R703-ABEK1 and Prefilter Holder R510. Provides protection against Particulates (P2), including those containing oils. Keep a clean pre-filter fitted to you main filter to ensure longer filter life. Also provides protection against liquid splashes and coarse particles before they reach the main filter. Certified to AS/NZS 1716.