A-Premium Upper Radiator Coolant Hose for BMW X3/X4 F25 F26 — Expansion Tank, Reinforced Heat-Resistant Rubber

A-Premium upper radiator coolant hose is a direct-fit replacement for BMW X3/X4 expansion tank connections, engineered to meet OEM dimensions and withstand engine bay heat and pressure.

This upper coolant hose from A-Premium replaces the factory line that runs between the expansion tank and the cooling system on specified BMW F25 and F26 models. Built from reinforced rubber and plastic components, it is shaped for the factory routing and carries reference numbers 17128651298 and SK121360 for quick identification. The part is precision-molded to the original inside diameter and connection angles so installation is straightforward for DIY mechanics and professional shops alike.

Which BMW models and engines is this hose compatible with?

This hose fits a range of BMW F25 and F26 chassis and specific engine types listed by the manufacturer. Confirm vehicle year and engine code before purchase to ensure correct fitment.

• BMW X3 F25: 2013–2017 L4 2.0L turbocharged
• BMW X3 F25: 2011–2017 L6 3.0L turbocharged and 2011–2012 L6 3.0L naturally aspirated
• BMW X4 F26: 2015–2017 L4 2.0L and L6 3.0L turbocharged
• Designed for petrol engines and expansion-tank upper connection location

How does this hose hold up to heat, pressure, and long-term use?

A-Premium manufactures this hose from heat-resistant rubber combined with durable plastic fittings to resist swelling, hardening, and coolant degradation. The product undergoes stress testing and quality control to align with or surpass OE expectations, reducing premature failure risk.

• Reinforced rubber compound for thermal stability
• Plastic connector sections molded to OE angles for leak-free joins
• Tested to meet typical engine bay pressure and vibration cycles
• Packaged in a protective box to prevent shipping damage

What should I know about installation and fitment checks?

Installation is straightforward when replacing the upper expansion-tank hose; clamps and mating surfaces should be inspected and replaced if corroded. Confirm the inside diameter and reference number to match the original hose before starting work.

• Inside diameter: 1.5 inch—verify against the original hose
• Reference numbers: 17128651298, SK121360 for cross-checking
• Sold as a single unit—replace clamps and coolant as needed
• Follow vehicle OEM service manual torque and bleed procedures

What warranty and support come with this A-Premium hose?

A-Premium backs this radiator coolant hose with a one-year, unlimited-mileage guarantee, giving buyers a safety net against manufacturing defects. Customer support is available for fitment questions and warranty claims.

• One-year unlimited-mileage guarantee from A-Premium
• Quality control testing documented by the manufacturer
• Box packaging to protect part during transit
• Customer support for compatibility and returns

Who is this for: This product is aimed at BMW owners, independent mechanics, and service shops replacing a worn or leaking upper radiator/expansion-tank hose on compatible X3 (F25) and X4 (F26) models. It suits people who need an OE-dimension, durable replacement with a straightforward installation path and warranty support, whether performing routine cooling system maintenance or repairing a coolant leak.