Canton - Billet Aluminum Water Fill Neck ExtendedThis extended fill neck raises the water fill point 6" above the manifold, which is ideal for bleeding off air within the cooling system. 6061 T6 Billet aluminum construction for light weight and durability in racing environments. The fill tube is angled at 45 degrees to provide clearance for large air filters, scoops, etc. Includes a 1 8"NPT to 3 8" barbed fitting for plumbing of an expansion tank. Accepts standard radiator caps or our #81 016 and