BMW B46D / B48D Aluminium Water Pump to Lower Radiator Hose Fitting

Upgrade the cooling system on your BMW B46D or B48D engine with the STROM Motorsports Aluminium Water Pump to Lower Radiator Hose Fitting. Designed as a durable replacement for the factory plastic coolant fitting, this upgraded component helps address a common potential leak point in B48-powered BMW and Toyota Supra applications.

The original plastic fitting connects the water pump housing to the lower radiator hose and uses a relatively small retaining lip. STROM developed this aluminium replacement to provide a stronger, more reliable solution while also accommodating both factory fitting variations.

Upgraded Aluminium Construction

Unlike the original plastic component, the STROM fitting is manufactured from aluminium for improved strength and durability. It is designed for long-term use in demanding cooling-system environments, making it an excellent preventative-maintenance upgrade or replacement for a leaking or damaged factory fitting.

Dual O-Ring Seal

For additional protection against coolant leaks, the fitting features two O-rings at the water pump connection. The dual-seal design provides additional sealing security between the fitting and water pump housing.

Universal Design for Both Factory Fitting Sizes

BMW produced different versions of the original water pump fitting, including 6.4mm and 7.5mm variants. The STROM replacement uses a 6.4mm fitting depth and is designed to work with either water pump housing, helping eliminate the need to disassemble the water pump simply to determine which version is fitted.

Key Features

• Aluminium replacement for the factory plastic coolant fitting

• Designed for BMW B46D and B48D engines

• Connects the water pump to the lower radiator hose

• Helps address a potential factory coolant leak point

• Strong and durable aluminium construction

• Dual O-ring sealing design

• 6.4mm fitting depth

• Designed to work with both factory water pump housing versions

• Supplied with two O-rings

• Straightforward installation

• Ideal for preventative maintenance, repairs and performance builds

Replaces BMW Part Numbers

Designed as an upgraded replacement for:

• 11515A88E70 – 7.5mm version

• 11518482253 – 6.4mm version

Vehicle Compatibility

Designed for B46D and B48D-powered applications, including vehicles from the following platforms:

• BMW G20

• BMW G22

• BMW G30

• BMW G01

• BMW G02

• BMW G29

• Toyota GR Supra with applicable B48 engine

Please confirm your vehicle and engine compatibility before ordering.

Reliable B48 Cooling System Upgrade

Whether you're replacing a leaking factory fitting or carrying out preventative maintenance, the STROM Motorsports B46D / B48D Water Pump to Lower Radiator Hose Fitting provides a robust aluminium alternative to the original plastic component.

With its dual O-ring design, aluminium construction and compatibility with both factory fitting depths, it is a simple but worthwhile upgrade for maintaining a reliable cooling system on B48-powered BMW and Toyota Supra applications.