Fit for Holley Dominator 4150 Series 7/8"-20 thread With vacuum pressure gauge，More stable with no risk of oil leakage Fittings are made of high-quality aluminum alloy The braided hose is made of stainless steel, rubber, and nylon. The hose is decorated with blue dots, not only a monotonous black color, but also more aesthetically pleasing Equipped with an additional connector, it is more convenient to use and has a wider range of applications Braided AN6 Dual Feed Carb Fuel Line Double Pump for Holley 4150 Carburetor with vacuum pressure gauge