At MSR, they understand the draw of the outdoors and the lessons nature can teach them, about themselves and the world at large. That's why they're committed to promoting active outdoor recreation and to protecting the public lands, wilderness areas, and waterways that sustain us all. MSR supports efforts in the Pacific Northwest-their own backyard-and around the globe that are dedicated to preserving these resources, encouraging people to get out and use them, and acting as advocates for their environmentally responsible use. Replacement prefilter assembly extends the life of your filter. Includes 1/4" diameter inlet hose.