These fully assembled Russell kits are manufactured by Russell in the USA in their QS9000-certified facilities. They include high-quality -6 ProFlex stainless steel braided hose with anodized AN fittings with 3/8” NPT inlet. ProFlex hose utilizes an extruded CPE inner liner reinforced with a fabric braid. Kits without a gauge include 1/8” pipe plug. These Dual Inlet Kits do not fit Holley 4010 or 4011 Series carbs.