The SL-18 is the perfect alternative to the SL-25 for those trailers that require a smaller "foot-print". It features 2 shut off valves to allow for multiple applications: place a bucket under the upper valve and/or attach a hose to the lower valve. The translucent material allows you to see your water level in this 18 gallon capacity Slant Load/Upright Caddy. 3 year warranty.