NISMO (Nismo) [Radiator Cap] NISMO 40th Anniversary Racing Radiator Cap with First-Generation NISMO Logo, Reproduction Design, 21430-RS011-40

Features This racing radiator cap improves cooling performance by maintaining higher pressure within the cooling system and reducing the risk of boiling or vaporizing coolant compared to standard radiator caps. Compared to standard caps with a valve opening pressure of 0.09 MPa (0.9 kg/cm²), this increases the boiling point by approximately 6°C. The top surface of the current racing radiator cap features a reproduction of the design originally sold in the 1990s. (Base part 21430-RS013) Product Notes - Because the NISMO racing radiator cap maintains high pressure within the cooling system, be sure to thoroughly check the radiator and hoses for damage and leaks before installation. Please note that over time, vehicle deterioration can cause increased pressure, even in areas where low pressure was not an issue. - Compatible with vehicles equipped with a compact radiator cap (outer diameter φ45). Features the original NISMO logo. Outer diameter φ45 Operating valve pressure P = 1.3 kg/cm² Seal: Heat-resistant silicone rubber