Constructed of high quality aluminum Brothers custom aluminum tanks are awesome!!! Our tanks have all been pressure tested to assure you that they meet your toughest safety standards. Tanks can be used with most popular gauges and sending units. All tanks are designed to fit under the rear of the bed and are available in top fill or side fill styles. Note you must notch the frame for side fill tanks. This is a side fill tank that will require installing the filler somewhere in the vehicle, above the top level of the tank. Brothers has some really good ideas on this - in the fender well, through the bedside, molded in the fender, etc. This tank holds approximately 20 gallons. Sending unit sold separately.