RapidPure Explorer Camp Housing Extension adds length to the filters that reduce bacteria and cysts. RapidPure captures viruses that are too small for other filtration systems to capture. The Explorer Camp Housing Extension is an added feature of the best in class RapidPure water purification system. The housing extension comes in 3 different sizes depending on your specific trip or activity: standard size, one-3.5in extension, and two-4.5in extensions.Adds length to the water filtration systemComes in three different sizes: standard, one 3.5in extension and two-4.5in extensionsFilters have a rated life of roughly 3750 gallons per inch of mediaGreat for hunting camps, camping, boats, and RV’sOutput is approximately 1.33 liters per minuteWARNING: This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to www.p65warnings.ca.gov