J's Racing | Coolant Hose Kit | Honda Civic Type R | FL5 2.0T K20C1 | 2023+Coolant hoses are exposed to harsh environments due to heat radiation from the engine, pressure and coolant temperature changes. In addition, genuine rubber hoses expand due to the pressure of the cooling water, and also lose pressure. The three layer structure of polyester silicone makes it difficult to harden even in severe temperature changes, and has excellent heat and pressure resistance. It prevents pressure loss even under load during sports