Manchester Tank Worthington Cylinders 20lb. Horizontal Cylinder. Permanently marked TOP for proper installation. Must be filled vertically and used in a horizontal position and comes with 1-3/4 in. Acme Fill with OPD. Has front and rear brackets for secure mounting. Comes in a size of 5.5 gallon and measures to 12.16 in. x 17.37 in. long. F20AHB. Features of Manchester Tank Worthington Cylinders 20 Lb. Horizontal Cylinder Can be mounted in a standard compartment Permanently marked TOP for proper installation Must be filled vertically Follow proper handling and safety instructions Package Contents: Manchester Tank Worthington Cylinders 20 Lb. Horizontal Cylinder Manchester Tank 296966: Worthington Cylinders 20lb. Horizontal Cylinder