Kargo Master 40100 Refrigerant Tank Rack Securely Holds 4 To 9-1&#47;2 In. Diameter&#44; 30 Pounds Tanks To Maximize Space 1&#47;4 In. Steel Bar Frame With Sloped Cradles And Nylon Retention Straps Included Fully Welded. No Assembly Required Mounting Location - Bolts To Van Wall Capacity - Four 30 Pounds Tanks