This aluminum coolant fitting is designed and manufactured to precise tolerances to fit the OEM application but with notable improvements in function. 

This Water Hose Fitting is made from high strength aerospace ...

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This aluminum coolant fitting is designed and manufactured to precise tolerances to fit the OEM application but with notable improvements in function. 

This Water Hose Fitting is made from high strength aerospace aluminum, Grade 6061 T6511. 

Also,it was designed to maximize the resistance to breakage.

In addition to this, the coolant flow path through the center of the fitting is optimized to maximize coolant flow. 

There are no sharp corners on this fitting so that the coolant will not be disrupted as it passes through. 

This product is an OEM replacement for the plastic fitting on BMW PN 11537541992 and 11537544638.

This Water Hose Fitting for BMW:

N52 X3

N20 (2.0L turbo) Z4 2013 & up

N54 (3.0L twin-turbo) motors 335i, 335xi, 135i.

N53 (3.0L non-turbo) 2006 - 2010 325i, 330i, 525i, 525xi, 528i, 528xi, 530i, 530xi.

This Water Hose fitting also fits the next generation N55 motors in all chassis.

Material: Aluminum

Size: 80 x 80 x 62mm/3.15 x 3.15 x 2.44"

You will get:

1 x EPDM O-ring 

1 x Billet aluminum fitting 

1 x Stainless steel hose clamp



  • This Water Hose Fitting fits 3.0L twin-turbo N54 (3.0-litre twin turbo) motors 335i, 335xi, 135i and the N53 (3.0-litre non-turbo) 2006 - 2010 325i, 330i, 525i, 525xi, 528i, 528xi, 530i, 530xi and the N20 (2.0-litre turbo) Z4 2013-, and the N52 X3. This fitting also fits the next generation N55 motors in all chassis.
  • This Water Hose Fitting is an OEM replacement for the plastic fitting on PN 11537541992,11537544638.It may called 11537541992 or N54 Water Hose Fitting.
  • This product is made from high strength aerospace aluminum, Grade 6061 T6511.It was designed to maximize the resistance to breakage.
  • There are no sharp corners on this fitting so that the coolant will not be disrupted as it passes through.The coolant flow is further optimized to improve cooling performance.
  • Feel free to contact us by emails if you have any problems.
  • This Water Hose Fitting fits 3.0L twin-turbo N54 (3.0-litre twin turbo) motors 335i, 335xi, 135i and the N53 (3.0-litre non-turbo) 2006 - 2010 325i, 330i, 525i, 525xi, 528i, 528xi, 530i, 530xi and the N20 (2.0-litre turbo) Z4 2013-, and the N52 X3. This fitting also fits the next generation N55 motors in all chassis.
  • This Water Hose Fitting is an OEM replacement for the plastic fitting on PN 11537541992,11537544638.It may called 11537541992 or N54 Water Hose Fitting.
  • This product is made from high strength aerospace aluminum, Grade 6061 T6511.It was designed to maximize the resistance to breakage.
  • There are no sharp corners on this fitting so that the coolant will not be disrupted as it passes through.The coolant flow is further optimized to improve cooling performance.
  • Feel free to contact us by emails if you have any problems.

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