BMW E81 / E82 / E87 / E88 1 Series, E90 / E91 / E92 / E93 3 Series & E84 X1 Coolant Expansion Tank Vent Hose with Billet Aluminum Flange (N52 / N52N / N51 Engines / Replaces 17127618510 / 17127565093)

Permanently solve the broken plastic coolant flange failure on your BMW E8X or E9X chassis with this premium expansion tank vent hose kit, featuring a 6061 billet aluminum flange and triple-ply reinforced silicone hose for permanent durability and reliable cooling system sealing. The factory plastic coolant reservoir hose flange is one of the most well-known weak points on N52, N52N, and N51-equipped BMW chassis — the flange is extremely prone to breaking both during routine cooling system service and during normal daily use. When this flange fails, the resulting coolant leak can quickly drain the cooling system, leading to engine overheating and serious damage if not addressed immediately. This repair kit replaces the failure-prone plastic flange with rigid billet aluminum construction and upgrades the factory rubber hose to high-pressure (3-bar rated) triple-layer silicone with an anti-aging formula that maintains long-term flexibility without hardening, cracking, or developing the seal failures that affect aged factory hoses.

Features:

• 6061 billet aluminum flange – permanently eliminates the cracking and breakage failure mode of the factory plastic coolant flange
• Triple-ply reinforced silicone hose – high-pressure (3-bar rated) construction with anti-aging formula maintains long-term flexibility without hardening or cracking
• Upgraded hose clamps – significantly more durable than the factory clamps which are not suitable for reuse after long-term service
• Direct OE replacement design – manufactured to factory specifications matching original equipment part numbers 17127618510 and 17127565093
• Anodized flange surface finish – delivers superior corrosion resistance and a clean professional aesthetic for long-term engine bay use
• High-temperature resistance – silicone construction maintains structural integrity under sustained engine operating temperatures where factory rubber hoses begin to degrade
• Aesthetic engine bay enhancement – customized silicone hose appearance elevates the engine bay beyond the cheap feel of factory rubber and plastic components

Specifications:

• Condition: 100% Brand New
• Type: Coolant Expansion Tank Vent Hose Kit
• Materials: 6061 Aluminum Alloy Flange, Triple-Ply Silicone Hose
• Hose Construction: Triple-Ply Reinforced Silicone
• Pressure Rating: 3 Bar (High Pressure)
• Surface Finish: Anodized (Aluminum Flange)
• Quantity: Complete Kit (Flange + Hose + Clamps)
• Position: Vent Line for Radiator / Expansion Tank
• Engine Compatibility: BMW N52 / N52N / N51 Engines
• Purpose: Direct Replacement / Performance Cooling System Upgrade

OE / Replacement Part Numbers:

• 17127618510 / 17 12 7 618 510
• 17127565093 / 17 12 7 565 093

US Market Fitment:

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

European Market Fitment:

• 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

Contents:

• 1x 6061 Billet Aluminum Flange
• 1x Triple-Ply Reinforced Silicone Hose
• Upgraded Hose Clamps

Benefits:

• Permanently eliminates the broken plastic flange failure mode that plagues N52 / N52N / N51 BMW cooling systems – aluminum construction will not crack, become brittle, or fail under sustained heat cycling
• Triple-ply silicone hose delivers significantly higher pressure rating (3 bar) and temperature tolerance compared to factory rubber – critical for tuned vehicles or aging cooling systems
• Anti-aging silicone formula maintains long-term flexibility without hardening or cracking – eliminates the recurring service interval of replacing aged factory rubber hoses
• Upgraded hose clamps deliver permanent reliable clamping force – significantly more reliable than factory spring clamps which lose tension over time
• Resolves coolant leaks, overheating, and pressure loss symptoms commonly traced to failed factory plastic flanges and aged rubber hoses
• Significant cost savings compared to repeated dealer replacement of failure-prone plastic components – this kit is a one-time permanent solution
• Aesthetic engine bay upgrade – clean silicone hose and machined aluminium flange replace the bland factory components with a refined, motorsport-grade appearance
• Pairs naturally with other cooling system refresh components for comprehensive N52 / N52N / N51 cooling system upgrades

Installation Notes:

• Engine code verification required: This kit is compatible with N52, N52N, and N51 engine variants. Verify your engine code before ordering – check the engine code stamp or consult vehicle service documentation
• Allow the engine to fully cool and the cooling system to fully depressurize before beginning service to avoid scalding from hot coolant
• Drain the radiator coolant into a clean container before removing the factory hose – coolant can be reused if clean and within service life
• Carefully remove the factory plastic flange and hose – take note of original orientation and clamp positioning
• Inspect the radiator outlet, expansion tank, and surrounding components during installation – replace any aged or damaged cooling system components for comprehensive system refresh
• Use the included upgraded hose clamps with proper tightening torque – do not overtighten, which can damage the silicone hose, but ensure adequate clamping force for leak-free sealing
• Refill the cooling system with manufacturer-specified coolant type after installation – do not mix coolant types
• Bleed the cooling system thoroughly after installation to remove trapped air – follow factory bleed procedure for the N52 cooling system
• Check for leaks after the engine reaches operating temperature and cycles through the thermostat opening – inspect all connections and re-tighten clamps if needed
• Professional installation strongly recommended unless you have experience with BMW cooling system service procedures
• If unsure about compatibility with your specific BMW variant or engine code, contact our team with your year, model, chassis code, and engine code before ordering

Warranty:

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