Outus 3/4" ID Silicone Heater Hose - 25ft Blue Coil, Reinforced High-Temp Coolant Line

Outus 3/4" ID 25ft silicone heater hose is a flexible, high-temperature coolant and radiator line designed for reliable sealing, long service life, and easy custom installation.

This reinforced silicone hose by Outus comes as a 25-foot coil with a 3/4" (19 mm) inner diameter, offering mechanics and hobbyists a durable alternative to standard rubber lines. Built with a braided polyester reinforcement, the tube resists high temperatures, aging, and common automotive fluids — while remaining soft and easy to cut for bespoke routing. It suits cooling systems, heater cores, and other thermal fluid circuits where a dependable, kink-resistant hose is required.

How does this hose handle engine heat and pressure?

The Outus silicone hose is formulated for elevated temperatures and steady pressure. It performs across a very wide thermal range and tolerates typical engine coolant pressures without permanent deformation.

• Temperature range: -40°F to 400°F (-40°C to 200°C) for broad environmental use.
• Working pressure: rated to 85 PSI with a burst capability around 170 PSI for safety margin.
• Material resilience: silicone compound resists thermal aging far better than standard EPDM.

Will this hose fit my vehicle and cut to my layout?

The hose comes in a continuous 25-foot coil so you can cut exact lengths for custom installations. Its 19 mm inner diameter and 27 mm outside dimension match many heater and radiator fittings, making it compatible with common engine ports.

• Length: 25 ft coil for multiple runs or one long custom line.
• Inner diameter: 3/4" (19 mm) for common heater and coolant applications.
• Easy trimming: soft silicone walls allow clean cuts with standard tools.

Is the hose chemically and mechanically durable?

Outus designed the hose to resist cracking, splitting, and degradation when exposed to hot fluids and mild chemicals. Reinforcement braid improves mechanical strength while silicone maintains flexibility even after prolonged heat exposure.

• Reinforcement: polyester braid for tear and pressure resistance.
• Chemical compatibility: suitable for air, steam, hot water, coolant and weak acids/alkalis (≤25%).
• Longevity: silicone resists hardening and brittleness that shorten rubber hose life.

How easy is installation and routine maintenance?

Installation is straightforward thanks to the hose's pliability and kink resistance. It slips onto fittings easily and seals reliably with standard clamps; routine checks are quick because the material shows visible signs if compromised.

• Flexibility: resists kinking for tidy routing in tight engine bays.
• Clamping: compatible with common worm-gear or Oetiker clamp styles.
• Serviceability: cut-to-length design simplifies repairs and replacements.

Who is this for? The Outus 3/4" ID silicone heater hose is aimed at DIY mechanics, performance tuners, restoration shops, and fleet technicians who need a reliable, high-temperature coolant line that can be customized on-site. If you require a hose that stays flexible in heat, resists common coolants and weak chemical exposure, and allows precise length cuts for bespoke installations, this Outus coil is a practical choice.