NOS Distribution Blocks are precision machined to help distribute balanced amounts of nitrous and fuel to each intake port. All NOS Distribution Blocks use 1/8 inch NPT in and are available with 1/8 inch NPT or 1/16 inch NPT out. Fittings must be ordered separately. 6061 Aluminum 3/8 in. NPT Inlet w/AN6 Fitting 4 x 1/8 in. NPT Outlets w/AN4 Fittings Parallel Inlet/Outlet Design Profiled Internal Passages For Max Flow/Min Pressure Drop Can Be Used w/Nitrous/Gasoline/Alcohol/Other Fluids Supplied Fittings Are 2024 Aluminum Additional Attributes: GTIN: 00090127746042 Color: Black Fitting Material: 2024 Aluminum Inlet Size: 0.375 in. NPT Material: 6061 Aluminum Outlet Size: 0.125 in. NPT Package Quantity: 1 WARNING CA Proposition 65: No Packaging: Quantity of Each: Package UOM: Dimension: 2.5000 x 2.5000 x 4.5000 inches