Class A Customs 21 Gallon Fresh/Gray Water Holding Tank & 12 Volt Artis Water Pump rv Concession Trailer T-2100 21 Gallon Capacity Fresh / Gray Water Holding Tank by Class A Customs NSF / FDA Certified Material - Fresh, Drinking Water Safe WATER TANK MEASUREMENTS: 34 Longest Length (not including fittings) x 9 x 16 (rotate tank to change height or width) Average thickness 7/32 +/- (+/- .25" on each measurement) BUILT-IN FITTING: (TWO) 1 " Dia screw in balloon fitting (threaded female - NPT Standard) fitting will be closed, to use remove inner membrane with razor knife (TWO)  " Dia screw in fittings (threaded female - NPT Standard) NON-PRESSURIZED TANK: you will need to vent this tank to use it, letting air in and out during use. Do NOT hook garden hose to tank use a fill dish. ARTIS 12 VOLT FRESH WATER PUMP MODEL # PDS1-130-1240E: NSF Approved Materials 3.0 GPM / Shut Off: 40 PSI / 7.0 Amp Draw @ 30 PSI / Self-Priming / On Demand Pump