The factory plastic coolant reservoir hose flange on BMW E8X and E9X models with the N52 engine is highly prone to cracking and breakage — both during routine maintenance and in everyday use. Once the flange fails, coolant leaks and dangerously elevated engine temperatures follow rapidly. This high-performance replacement kit permanently resolves that weakness by pairing a 6061 anodized aluminum alloy flange with a triple-layer reinforced silicone hose rated to 3 bar pressure and high-temperature operation. An anti-aging silicone formula maintains long-term flexibility without hardening or cracking, upgraded stainless steel hose clamps replace the factory units unsuitable for reuse, and the finished result is a significantly more reliable and visually superior cooling system connection than the OEM plastic setup.

Features:

• 6061 anodized aluminum alloy flange permanently replaces the factory plastic flange – eliminating the cracking and breakage failure mode on E8X and E9X cooling systems
• Triple-layer reinforced silicone hose rated to 3 bar pressure and high operating temperatures for long-term cooling system integrity
• Special anti-aging silicone formula maintains flexibility over time – no hardening, no cracking, and no risk of sealing failure
• Upgraded stainless steel hose clamps included – factory clamps are not suitable for reuse after extended service
• Direct replacement for OEM part numbers 17127618510 and 17127565093

Specifications:

• Condition: 100% Brand New
• Type: Coolant Expansion Tank Hose & Flange Kit
• Material: 6061 Aluminum Alloy & Silicone
• Flange Finish: Anodized
• Hose Construction: Triple-Layer Reinforced Silicone
• Pressure Rating: 3 Bar
• Mounting Position: Vent Line – Radiator to Expansion Tank
• Engine: N52 · N52N · N51
• OEM Replacement Part Numbers: 17127618510 · 17127565093
• Item Weight: 0.383 kg

Fitment (Europe):

• BMW 1 Series E81 130i N52N (2006–2010) – EUR only
• BMW 1 Series E82 125i N52N (2006–2013) – EUR only
• BMW 1 Series E87 130i N52 · N52N (2005–2011) – EUR only
• BMW 1 Series E88 125i N52N (2006–2013) – EUR only
• BMW 3 Series E90 · E91 · E92 · E93 323i · 325i · 328i · 330i (2005–2012)
• BMW X1 E84 25ix · 28ix N52 (2009–2011) – EUR only

Fitment (USA):

• BMW 1 Series E82 128i N52N · N51 (2006–2013) – USA only
• BMW 1 Series E88 128i N52N · N51 (2006–2013) – USA only
• BMW 3 Series E90 · E91 · E92 · E93 323i · 325i · 328i · 330i (2005–2012)

Contents:

• 1x 6061 Anodized Aluminum Alloy Flange
• 1x Triple-Layer Reinforced Silicone Expansion Tank Hose
• Upgraded Stainless Steel Hose Clamps included

Benefits:

• Permanently resolves the known factory plastic flange failure point on N52 E8X and E9X cooling systems
• Triple-layer silicone hose and 3 bar pressure rating provides far greater cooling system reliability than the OEM rubber hose
• Anti-aging silicone formula prevents the gradual hardening and cracking that leads to OEM hose sealing failures over time
• Complete kit eliminates the need to source a replacement flange, hose, and clamps separately
• Anodized aluminum flange delivers a cleaner, more premium engine bay appearance compared to the factory plastic unit

Installation Notes:

• Compatible with N52 · N52N · and N51 engine applications only – confirm engine code before ordering
• Do not reuse factory hose clamps – upgraded stainless steel replacements are included in this kit
• EUR market restrictions apply to E81 · E87 · and X1 E84 variants – confirm market specification before ordering
• USA market restrictions apply to E82 128i and E88 128i variants – confirm market specification before ordering
• If unsure about compatibility, contact our team with your vehicle's year, model, and engine code prior to purchase

Warranty:

• 12-month standard warranty from date of purchase
• Contact our support team for assistance with any issues