NDesign - B58 Gen2 Water Pump Plug

NDesign B58 Gen2 Water Pump Plug

Front coolant return port plug for the B58 Gen2 water pump housing — installed in place of the OEM BMW plastic connecting pipe (part number 11518482258), which factory-connects the radiator return hose to lower port on water pump.

When building a drift car, main radiator is typically relocated to the rear of vehicle and connected to the engine via AN lines (commonly AN16). In this configuration, coolant enters engine from rear of the water pump, making factory front port redundant. Instead of OEM plastic elbow, this port is sealed with a durable metal plug and O-ring.

Machined from 2024-T4 aluminum alloy, anodized. Includes an O-ring for sealing.

Do not use this plug if you're retaining the factory front-radiator cooling configuration.