Outus Silicone Radiator & Heater Hose 1-1/4" ID (5 ft) Blue — Reinforced, High-Temp Flexible

Outus 1-1/4" ID, 5ft blue silicone heater hose is a flexible, high-temperature coolant and radiator line built with reinforced braid for long-lasting, crack-resistant performance.

This 5-foot silicone hose from Outus is engineered for automotive cooling, heater core lines, and other hot-fluid applications that demand temperature resilience and flexibility. With a 32 mm inner diameter (1-1/4") and 42 mm outer diameter, it ships as a single coil so you can cut it to length for custom runs. The silicone compound plus polyester reinforcement offers improved aging resistance compared with standard EPDM rubber, while still allowing easy installation and a secure seal when paired with standard hose clamps.

How does this hose hold up to high temperatures and pressure?

The Outus silicone hose is formulated to tolerate extreme heat and cold, performing across a wide range from -40°F to 428°F (-40°C to 220°C). It’s rated for working pressures up to 60 PSI and demonstrates a burst resistance around 142 PSI, making it suitable for many engine cooling and heater applications where elevated temperatures are routine.

• Temperature range: -40°F to 428°F (-40°C to 220°C)
• Working pressure: up to 60 PSI; burst rating ~142 PSI
• Reinforced with polyester braid for strength under heat

Will it fit my vehicle and how easy is installation?

The hose measures 1-1/4" (32 mm) inside and 42 mm outside, supplied as a 5-foot coil so you can cut it to the exact length you need. Its flexibility reduces the chance of kinking in tight runs and it seals reliably with standard clamps, making it a straightforward direct-replacement or custom-route solution for radiator lines, heater core hoses, and vacuum lines.

• Inner diameter: 1-1/4" (32 mm); outer diameter: 42 mm
• Supplied as a 5 ft coil for custom fitting
• Flexible, kink-resistant, cuts easily with utility knife

What fluids and environments is the hose compatible with?

Outus designed this silicone hose to be versatile across common automotive and light industrial fluids. It resists steam, hot water, air, and most coolants, and tolerates weak acids and alkalis up to 25% concentration. As with any replacement, confirm compatibility with specialty fluids or concentrated chemicals before prolonged use.

• Suitable for coolant, hot water, steam, and air
• Resistant to weak acids and alkalis (≤25%)
• Good compatibility with standard automotive coolants

How durable is the hose over time and under repeated use?

The silicone material resists cracking, hardening, and UV-related aging better than many EPDM alternatives, giving longer service life in hot-engine environments. Note that silicone will slightly expand or soften under sustained high heat—this is normal and does not indicate failure. Proper clamp selection and correct installation ensure consistent sealing and longevity.

• Silicone resists aging and cracking compared with EPDM
• Slight thermal expansion/softening can occur but won’t affect function
• Use appropriate clamps and avoid overtightening to prevent damage

Who is this for: Mechanics, DIY enthusiasts, and fleet maintainers who need a dependable, heat-resistant replacement or custom-length coolant/heater hose will benefit from the Outus 1-1/4" ID silicone hose. It’s aimed at anyone retrofitting engine cooling or heater systems, fabricating custom plumbing runs for performance builds, or replacing aged rubber lines with a longer-lasting silicone solution. Verify hose dimensions and fluid compatibility for your specific application before installation.