R4R5 engine block screw plug Thread 18 NPT very similar to M10x1, often confused). Suitable for

Renault R4 and R5 (engine 688, C1E + CIC, cubic capacity 956cm³ + 1108cm³). This screw is mounted at least 2x in the engine block. For complete draining of the coolant from the engine, this screw can be unscrewed! Or. No. 7703075009