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Lifestraw Universal Straw Adapter
Universal bottle filter adapter Hollow fibre filter lifetime: 4,000 liters Pores clog over time as the filter is used; reaching end of life when water cannot pass throughCarbon filter lifetime: 25 gallons (100 liters). With frequent use, recommended to change filter every 3 monthsThreading diameter for wide cap – 63mmThreading diameter for narrow cap – 43mmCompatible with Nalgene, Camelbak, Hydroflask, Klean Kanteen