High Temperature Reinforced Silicone Couplers for Coolant Applications

RAINBOW is an ISO 9001-certified manufacturer specializing in high-performance silicone couplers for automotive and industrial applications. Constructed with premium silicone rubber and reinforced with 3-ply or 4-ply layered architecture, these hoses deliver outstanding burst resistance and long-term reliability. They maintain structural integrity across an extensive temperature spectrum, performing flawlessly from -55°C to +200°C.

Each coupler is meticulously crafted and undergoes rigorous quality inspections to ensure compliance with international standards. Designed for demanding coolant systems and custom fluid transfer solutions, our couplers combine exceptional durability with superior flexibility. Featuring a vibrant, smooth exterior with a glossy wipe-clean finish, our hoses provide both aesthetic appeal and practical cleanliness. They are ideal for: high-performance automotive cooling systems, custom engine bay plumbing, industrial machinery fluid transfer, aftermarket upgrades and replacements, etc.

It is not recommended to use universal silicone couplers for oil or fuel plumbing purposes. Occasional oil spills/leaks are manageable, but continuous petroleum exposure is beyond its tolerance. Should you require oil/fuel-resistant couplers, please feel free to inform us—we can manufacture couplers using a different type of silicone that offers oil/fuel resistance.

Why is a Reinforced Silicone Coupler recommended for use? Compared to ordinary rubber hoses, the silicone coupler boasts greater strength, enhanced toughness, and superior flexibility. Constructed from top-tier silicone, Rainbow Silicone Hose provides superior temperature resistance, making it highly suitable for cooling/heating systems and charged-air applications alike. Not only do they have a longer longevity, but they also perform better—and they won’t lose their shape or deform under extreme circumstances. This performance modification is both cost-effective and practical, making it fit for all types of vehicles.

Please refer to the silicone coupler catalogues below, which include silicone elbows, silicone reducers, and silicone humps. Don’t hesitate to let us know whether the size you’re looking for is included in the list. We also provide silicone couplers tailored to your specific needs.

We offer the design of different silicone coupler hoses to fit your unique application. Just share your specifications with us by email, and we’ll produce the hoses tailored to them. Customization options for the hose include length, color, size, and reinforcements. RAINBOW offers an extensive range of sizes, including both standard inch measurements and hard-to-locate metric sizes, to meet high market demand.