WASHABLE XL Filter for MAC Air Helmet Pumper provides increased filtration with more surface area, ideal for intense, dirty conditions like consistent racing or navigating through silt beds. This filter, hand-built with prime materials, combines multiple layers of breathable media and unique filtration technology, trapping minute dust particles that standard cotton-gauze filters can't capture. The filter is fully washable, reusable, featuring a sturdy build sure to endure for a considerable duration. This clamp-on design includes a replacement hose clamp for secure attachment to the 3in MAC1, MAC3.2, and MAC Air Pumper intake. Compatible with MAC Air, MAC1, or MAC3.2 Pumper System only.