Outus Silicone Heater Hose 3/4" ID 10ft Blue – Reinforced, Heat-Resistant Coolant Line

The Outus 3/4" ID, 10ft blue silicone heater hose is a flexible, reinforced coolant line built to withstand high temperatures and pressures for radiator, heater, and engine cooling applications.

This 10-foot coil of blue silicone hose is engineered as a durable replacement or upgrade for factory heater and coolant lines. Made from heat-tolerant silicone with a reinforced polyester braid, the hose resists cracking and aging that commonly affects rubber alternatives. It is supplied in a single 10 ft length so you can cut and fit custom runs for most automotive, marine, or small-engine cooling systems.

How does this hose handle heat and pressure?

The Outus silicone hose works across extreme temperatures and maintains integrity under moderate working pressures. Its silicone compound remains stable from very cold to very hot conditions, and the internal braid adds strength to resist bulging under load.

• Temperature range: -40°F to 400°F (-40°C to 200°C)
• Rated working pressure: up to 85 PSI; burst tested to 170 PSI
• Reinforcement: polyester braid for improved pressure resistance
• Silicone material reduces cracking and hardening over time

Will this fit my vehicle’s heater or radiator ports?

The hose has a 3/4" (19 mm) inner diameter and a 27 mm outer diameter, making it compatible with many standard heater cores, radiator nipples, and vacuum or coolant fittings. Because it comes in a 10 ft coil, you can trim it to exact lengths for custom routing or replacement jobs.

• Inner diameter: 3/4" (19 mm)
• Outer diameter: 27 mm
• Supplied length: 10 feet for cutting to fit
• Flexible and kink-resistant for tight routing

What fluids and environments is this hose suitable for?

This silicone hose is designed for automotive and light industrial uses where hot water, coolant, steam, or mild chemical exposure occurs. It resists common automotive coolants and can handle weak acids and alkalis up to about 25% concentration, making it versatile for many systems.

• Compatible with engine coolants, hot water, and steam
• Resistant to weak acids and alkalis (≤25%)
• Not recommended for strong solvents or concentrated acids
• Good aging resistance compared with standard EPDM hoses

How easy is it to install and maintain?

Installation is straightforward: cut the coil to length, slide on clamps, and secure to fittings. The material stays flexible for easier routing and seals reliably when used with proper clamps. Note that silicone can soften slightly at very high temperatures, which is normal and does not affect performance.

• Cut-to-fit 10 ft coil for custom installs
• Flexible, kink-resistant construction for clean routing
• Use standard hose clamps for a secure seal
• Expect minor thermal expansion under extreme heat—no impact on function

Who is this for: The Outus 3/4" ID silicone heater hose is aimed at DIY mechanics, performance enthusiasts, fleet maintenance teams, and small-engine technicians who need a heat-resistant, long-lasting coolant line. Choose this hose for radiator repairs, heater core replacements, custom plumbing in hot environments, or when upgrading older rubber hoses for greater durability and temperature tolerance.