Reduzierer (Kunststoff) 4-3mm Connector - Plastic - 4mm - 3mm Universal plastic hose connector for fuel-, water or oil lines The connector is made of plastic and lightweight. It is oil and fuel resistant. Suitable for coolant and air lines as well. For hose diameter: 4mm - 3mm Material: Acetalcopolymerisat Style: connector PLEASE NOTE: The outside diameter of a 12mm connector, reducer or t-piece is slightly larger than 12mm in order to fit tightly on a hose with an inside diameter of 12mm. For a strong connection, we recommend our clamps.