5000 Gallon Low Vertical (straight-wall) Water Storage Tank. Tanks are available in Black, Dark Green and Sand (Tan) in sizes up to 3000 gallons, and Black and Dark Green in sizes above 3000 gallons. Features:Polyethylene water tanks are designed for water storage only at atmospheric pressure only and venting equipment should be sized to limit pressure or vacuum to a maximum of 1/2" water column (0.018 PSI).The tank is made from Bpa free, FDA Compliant.The resin is NSF certified manufacturing plants.Must use flexible connectors on all fitting connections per tank manufacture's recommendations.