Heavy-duty virgin polyethylene cone bottom with complete drain type outlet Lid construction is molded into the tank design and has a single gasketed screw on lid Tank comes complete with PVC schedule 80 type 1 fittings and true union ball valves for tank drain, pump feed, loop return, and loop drain. Also included is a back pressure relief valve, flow meter, sample port, stainless steel liquid filled pressure gauge, temperature gauge, and return spray nozzle to continuously wash down the inside of the tank. Hydrophobic 0.2 sub-micron vent filter assembly with “rupture disc finger” for relief in case of over pressure or vacuum conditions on the tank Tank has installed switches for RO On/RO Off/Low Level Alarm/Low Level Pump Shut Down Sizes available: 55, 100, 185, 250 gallon tank capacity