Thumbnail Filmstrip of TBS 4372 Polished Stainless Lines - Dual Inlet 4150 Carb Fuel Lines - Polished Images
3/8" stainless steel polished fuel line tubing for use with two 4150 style carbs. see also TBS-4372-AB
Also see TBS-4373 Bridal to tie them together into 1 inlet.
With AN6 fittings these provide a single fuel connection per carburetor to supply fuel to both carburetor bowls.