"This Worthington Cylinders 20-lb. 4.7 gallon propane tank is manufactured to DOT specifications. An OPD valve prevents the hazards caused by overfilling the tank. Powder-coated for years of service. U.S.A. Finish Type Powder-coat, Compatible With Propane, Capacity 20 Lb. 4.7 gallons, Common Usage Propane tank, Cylinders qty. 1, Closure Type OPD valve."