It's very easy to fill your WaterPORT™ tank with your garden hose. It fills quickly and gets to the correct P.S.I. automatically. But sometimes you aren't at home! Sure, you can re-pressurize your tank with a bike pump, but what if you don't want to carry one round? Features: Replaces stock fill caps and allows you to easily add pressure when on the road Less than 30 seconds of pumping brings the tank up to the optimal P.S.I. for cleaning, showering, spraying, etc. Compatible with the WaterPORT 2 gallon, 4 gallon, and 8 gallon tanks Dimensions: 9.5 x 4 x 4 in / 24 x 10 x 10 cm Weight: 6 oz / 170 g