Taste the sweeter side of tap water! TapGuard makes safe water taste better by removing chlorine and other chemicals that can give tap water a bad taste. Just install in the neck of your Nalgene, CamelBak or other widemouth bottle and drink great tasting water almost anywhere. No wait, no hassle, no bottled-water waste. Refills are good for 100 liters. BPA and polycarbonate free! Weight: 1.5 oz/ 42 g. Length: 3"/ 6.7 cm. Diameter: 2.16"/ 5.5 cm. For use on safe, potable water only.