4-PERSON HELMET AIR PUMPER BUNDLE MOOSE - 0136-0067Features Stay cool and eliminate dust with the MAC Air helmet pumper Constructed using injection molded ABS polymer, the housing is optimized for increased airflow Utilizes a dual filtering system that increases performance and prevents premature clogging External pre filter features uniform micro openings that filter out most dust and debris before it can reach the internal filter Rocker Switch Variable Speed Controller (VSC) gives you quick, easy