Phoenix Air Max Valve Stem Extenders install quickly to make checking and inflating your tires a much easier job. The extensions feature braided stainless steel construction.• Braided stainless steel valve extension kit• For inner and outer rear dual wheels• Use with 16" DOT simulator kits with 25mm mounting holes• Includes 4 extensions and 4 brackets For inner & outer rear dual wheels Use with 16"" DOT simulator kits with 25mm mounting holes Includes 4 extensions & 4 brackets | Phoenix USA Air Max AML1 Valve Extension Kit for Inner and Outer Rear Dual Wheels