The Worthington Cylinders 20 Lb Steel Propane Cylinder has a 10 percent valve and Pol safety plug. Quality construction and a durable polyurethane finish. Specifications: Size 6-1/2" x 12-3/8" x 18-1/16". LP-Gas capacity (approximate gallons) 5, water capacity 47.7 pounds, tare weight 18.5 pounds, cylinder volume 1,323 cubic inches, collar height 4", footing diameter outside 7-13/16". Manufactured in accordance with DOT-4BA-240.