Turbosmart - Reference Distribution Block (5 Port) 1/8NPTTurbosmart Reference Distribution Block (5 Port) 1 8NPT The Turbosmart Simple Reference Manifold Block is a professional solution for remote mounting and sharing of engine (MAP) reference with multiple outputs such as Fuel Pressure Regulators, Maps Sensors, Boost Gauges, Wastegates and Brake Boosters. Manufactured from Billet (6262 T6) Aluminium and Black anodized, with 4 x 1 8 NPT Ports and a simple 1 4 NPT Port, the Simple Reference Distribution