Steripen pre-filter

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The SteriPEN Pre-Filter removes debris from water so the UV light can effectively destroy the microorganisms in it. Forms water tight seal with 

 SteriPEN Classic 3SteriPEN Ultra or SteriPEN Aqua.

Size: 1.85 in. (47mm) x 2.6 in. (67mm)
Weight: 1.5 oz (43g)
40 micron durable nylon screen
Reversible cartridge for compact convenient storage
Dual water seals to prevent contamination of drinking surface
Used with Nalgene® and other 32 ounce wide-mouth water bottles