Gates 25804 Vulco-Flex II Flexible Coolant Hose,Black

The Gates 25804 Vulco-Flex II Flexible Coolant Hose is a universal radiator hose designed to route coolant through engine bays without requiring rigid pre-shaped lines. It works well for vehicle owners, mechanics, and restorers who need a dependable replacement hose that can bend into place easily.

Built with high flexibility, this hose routes through tight engine spaces to simplify installation across a broad range of applications. It features an improved sealing surface engineered for better leak resistance at the connection points. The construction is resistant to heat, oil, and ozone, and it is rated for SAE 20R5 Class D-2 performance.

One clear limitation is the fixed sizing: End 1 features a 1.5-inch inside diameter, meaning it will only fit cooling system ports of that specific dimension. In addition, the listing does not provide overall length measurements or details on End 2 dimensions, so you must verify your vehicle fitment requirements before purchasing.

Verdict: The Gates 25804 Vulco-Flex II hose is a solid choice for drivers and mechanics needing a flexible, oil- and heat-resistant 1.5-inch coolant line. It delivers standard-rated durability and easy routing for compatible vehicle cooling systems.

A great fit if you:

• Need a flexible radiator hose with a 1.5-inch inside diameter
• Want hose material that resists heat, oil, and ozone exposure
• Prefer a bendable design that simplifies coolant routing during repairs

Consider something else if you:

• Require an inner diameter size other than 1.5 inches
• Need a direct-fit molded hose with specific fixed bends

What is the inner diameter of this hose?
End 1 has an inside diameter of 1.5 inches.

What performance standards does this hose meet?
This hose is rated for SAE 20R5 Class D-2 performance.

What environmental elements is this hose resistant to?
It is built to resist damage from heat, oil, and ozone.