EVIL ENERGY 3/4" Silicone Heater Hose 5ft — SAE J20R3 Class A, 60 PSI, Black

EVIL ENERGY 3/4" silicone heater hose is a 5-foot, straight SAE J20R3 Class A coolant and heater line engineered for durable, high-temperature vehicle and equipment applications.

This silicone heater hose combines braided polyester reinforcement with inner and outer silicone layers to provide flexible, long-lasting service in automotive cooling and heating circuits. Designed to meet SAE J20R3 Class A requirements, it delivers a wide operating temperature window and strong pressure performance for hot coolant, water, steam and similar fluids while avoiding fuels and oils.

What are the key dimensions and tolerances of this heater hose?

The hose has a 3/4" (19 mm) inner diameter and an outer diameter near 1-1/16" (27 mm), with measured tolerances to maintain reliable fitment. The 5-foot length lets you route, trim and clamp the hose for most OEM or custom repair jobs.

• Inner diameter: 3/4" (19 mm) with ±0.4 mm tolerance
• Outer diameter: ~1-1/16" (27 mm) with ±0.4 mm tolerance
• Length: 5 ft (factory cut, ready to trim)
• Minimum bend radius: 95 mm for correct installation

How does this silicone hose perform under heat and pressure?

Engineered for high-temperature environments, the hose supports continuous and intermittent service across a broad temperature range and resists failure under pressure. It’s suitable for cooling and heating loops where heat cycling and steam exposure are common.

• Working pressure: 60 psi for typical system use
• Burst pressure: 203 psi for safety margin under spikes
• Temperature range: -67°F to 356°F (-55°C to 180°C)
• Meets SAE J20R3 Class A material and construction standards

What materials and fluids is the hose compatible with?

The hose features braided polyester reinforcement encapsulated by silicone inner and outer layers, which boosts thermal stability and longevity compared with many rubber compounds. It is intended for water-based and low-aggression fluids rather than hydrocarbons.

• Construction: braided polyester fiber reinforcement with silicone inner/outer layers
• Suitable for: coolant, water, steam, transport air, weak acids and alkaline solutions
• Not suitable for: alcohol, gasoline, diesel, engine oil, or lubricating fluids
• Common uses: automotive cooling, heater cores, water heaters, and similar systems

How do I fit and care for the EVIL ENERGY heater hose?

Trim to length with a clean cut and use correct-size clamps to avoid compression damage; respect the minimum bend radius to prevent kinking. Regular inspections for abrasion, hardening or surface cuts will extend service life, and replacement is straightforward when wear appears.

• Trim with a sharp blade and deburr cut ends before fitting
• Use stainless or high-quality clamps sized for 3/4" ID hoses
• Avoid sharp bends—keep bend radius >95 mm where possible
• Inspect periodically for cracking, oil exposure, or external damage

Who is this hose for? Installers, mechanics and DIY enthusiasts who need a resilient, high-temperature coolant or heater line will find this EVIL ENERGY silicone hose well suited to car, truck and equipment applications. It’s aimed at users who require consistent dimensional tolerances, broad thermal capability and SAE-class construction for reliable fitment and longer service life in non-fuel fluid systems.