Nissan Laurel C33 Cylinder Head Coolant Passage Plug RB20

The Nissan Laurel C33 Cylinder Head Coolant Passage Plug for RB20 engines is a precision-engineered component designed to ensure the integrity and efficiency of the engine’s cooling system. Positioned in threaded ports along the intake or exhaust sides of the cylinder head, this taper plug, also called a blind thread or coolant gallery sealing plug, securely seals the ends of the internal coolant passages. By preventing leaks and maintaining proper coolant flow, it safeguards the engine against overheating, corrosion, and hot spots, which is essential during high-boost or high-RPM operation in RB-series engines. Manufactured from durable steel with an M12x1.25 thread and a slight taper, the plug expands slightly when torqued to create a reliable, gasket-free seal. This precise fit preserves coolant pressure, prevents air ingress, and ensures consistent thermal management, protecting critical components such as the combustion chambers, valves, and exhaust ports. Routine inspection or re